Fixes #194

I kept getting frustrated that I couldn't find when `exists_ok` was added without looking at the commit history.

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [google-cloud-bigquery](https://togithub.com/googleapis/python-bigquery) | minor | `==1.25.0` -> `==1.26.1` |

---

### Release Notes

<details>
<summary>googleapis/python-bigquery</summary>

### [`v1.26.1`](https://togithub.com/googleapis/python-bigquery/blob/master/CHANGELOG.md#&#8203;1261-httpswwwgithubcomgoogleapispython-bigquerycomparev1260v1261-2020-07-25)

[Compare Source](https://togithub.com/googleapis/python-bigquery/compare/v1.26.0...v1.26.1)

### [`v1.26.0`](https://togithub.com/googleapis/python-bigquery/blob/master/CHANGELOG.md#&#8203;1260-httpswwwgithubcomgoogleapispython-bigquerycomparev1250v1260-2020-07-20)

[Compare Source](https://togithub.com/googleapis/python-bigquery/compare/v1.25.0...v1.26.0)

##### Features

-   use BigQuery Storage client by default (if dependencies available) ([#&#8203;55](https://www.github.com/googleapis/python-bigquery/issues/55)) ([e75ff82](https://www.github.com/googleapis/python-bigquery/commit/e75ff8297c65981545b097f75a17cf9e78ac6772)), closes [#&#8203;91](https://www.github.com/googleapis/python-bigquery/issues/91)
-   **bigquery:** add **eq** method for class PartitionRange and RangePartitioning ([#&#8203;162](https://www.github.com/googleapis/python-bigquery/issues/162)) ([0d2a88d](https://www.github.com/googleapis/python-bigquery/commit/0d2a88d8072154cfc9152afd6d26a60ddcdfbc73))
-   **bigquery:** expose date_as_object parameter to users ([#&#8203;150](https://www.github.com/googleapis/python-bigquery/issues/150)) ([a2d5ce9](https://www.github.com/googleapis/python-bigquery/commit/a2d5ce9e97992318d7dc85c51c053cab74e25a11))
-   **bigquery:** expose date_as_object parameter to users ([#&#8203;150](https://www.github.com/googleapis/python-bigquery/issues/150)) ([cbd831e](https://www.github.com/googleapis/python-bigquery/commit/cbd831e08024a67148723afd49e1db085e0a862c))

##### Bug Fixes

-   dry run queries with DB API cursor ([#&#8203;128](https://www.github.com/googleapis/python-bigquery/issues/128)) ([bc33a67](https://www.github.com/googleapis/python-bigquery/commit/bc33a678a765f0232615aa2038b8cc67c88468a0))
-   omit `NaN` values when uploading from `insert_rows_from_dataframe` ([#&#8203;170](https://www.github.com/googleapis/python-bigquery/issues/170)) ([f9f2f45](https://www.github.com/googleapis/python-bigquery/commit/f9f2f45bc009c03cd257441bd4b6beb1754e2177))

##### Documentation

-   **bigquery:** add client thread-safety documentation ([#&#8203;132](https://www.github.com/googleapis/python-bigquery/issues/132)) ([fce76b3](https://www.github.com/googleapis/python-bigquery/commit/fce76b3776472b1da798df862a3405e659e35bab))
-   **bigquery:** add docstring for conflict exception ([#&#8203;171](https://www.github.com/googleapis/python-bigquery/issues/171)) ([9c3409b](https://www.github.com/googleapis/python-bigquery/commit/9c3409bb06218bf499620544f8e92802df0cce47))
-   **bigquery:** consistent use of optional keyword ([#&#8203;153](https://www.github.com/googleapis/python-bigquery/issues/153)) ([79d8c61](https://www.github.com/googleapis/python-bigquery/commit/79d8c61064cca18b596a24b6f738c7611721dd5c))
-   **bigquery:** fix the broken docs ([#&#8203;139](https://www.github.com/googleapis/python-bigquery/issues/139)) ([3235255](https://www.github.com/googleapis/python-bigquery/commit/3235255cc5f483949f34d2e8ef13b372e8713782))

</details>

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…#185)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [llvmlite](http://llvmlite.pydata.org) ([source](https://togithub.com/numba/llvmlite)) | minor | ` <= 0.31.0` -> `<=0.33.0` |

---

### Release Notes

<details>
<summary>numba/llvmlite</summary>

### [`v0.33.0`](https://togithub.com/numba/llvmlite/blob/master/CHANGE_LOG#v0330-June-10-2020)

[Compare Source](https://togithub.com/numba/llvmlite/compare/v0.32.1...v0.33.0)

This release upgrades to LLVM 9 and drops support for older LLVM versions.

Pull requests:

-   PR [#&#8203;593](https://togithub.com/numba/llvmlite/issues/593): Fix CUDA with LLVM9
-   PR [#&#8203;592](https://togithub.com/numba/llvmlite/issues/592): Fix meta.yaml
-   PR [#&#8203;591](https://togithub.com/numba/llvmlite/issues/591): buildscripts: Unpin wheel
-   PR [#&#8203;590](https://togithub.com/numba/llvmlite/issues/590): add python_requires to setup.py
-   PR [#&#8203;582](https://togithub.com/numba/llvmlite/issues/582): Adds override for LLVM version check, re-formats docs.
-   PR [#&#8203;581](https://togithub.com/numba/llvmlite/issues/581): Add FAQ entry on LLVM version support.
-   PR [#&#8203;580](https://togithub.com/numba/llvmlite/issues/580): Trove classifiers may be out of date.
-   PR [#&#8203;577](https://togithub.com/numba/llvmlite/issues/577): llvmlite wheel building fixes
-   PR [#&#8203;575](https://togithub.com/numba/llvmlite/issues/575): Update the release date
-   PR [#&#8203;548](https://togithub.com/numba/llvmlite/issues/548): Upgrade to LLVM9
-   PR [#&#8203;521](https://togithub.com/numba/llvmlite/issues/521): Allow instructions to be removed from blocks

Authors:

-   Graham Markall
-   Jan Vesely
-   Siu Kwan Lam  (core dev)
-   Stuart Archibald  (core dev)
-   Tim Babb
-   Valentin Haenel  (core dev)

### [`v0.32.1`](https://togithub.com/numba/llvmlite/blob/master/CHANGE_LOG#v0321-May-7-2020)

[Compare Source](https://togithub.com/numba/llvmlite/compare/v0.32.0...v0.32.1)

This is a small patch release that addresses some packaging issues:

Pull requests:

-   PR 580: Trove classifiers may be out of date.
-   PR 581: Add FAQ entry on LLVM version support.
-   PR 582: Adds override for LLVM version check, re-formats docs.

Authors:

-   Stuart Archibald (core dev)
-   Valentin Haenel (core dev)

### [`v0.32.0`](https://togithub.com/numba/llvmlite/blob/master/CHANGE_LOG#v0320-Apr-16-2020)

[Compare Source](https://togithub.com/numba/llvmlite/compare/v0.31.0...v0.32.0)

The main changes in this release are the removal of specific code for Python 2
and Python &lt;3.6, and making the code base PEP8 compliant.

Pull requests:

-   PR [#&#8203;577](https://togithub.com/numba/llvmlite/issues/577): llvmlite wheel building fixes
-   PR [#&#8203;560](https://togithub.com/numba/llvmlite/issues/560): ENH: Better error message
-   PR [#&#8203;558](https://togithub.com/numba/llvmlite/issues/558): update install docs
-   PR [#&#8203;556](https://togithub.com/numba/llvmlite/issues/556): binding: Allow empty features list
-   PR [#&#8203;555](https://togithub.com/numba/llvmlite/issues/555): travis: Cleanup
-   PR [#&#8203;554](https://togithub.com/numba/llvmlite/issues/554): azure-pipelines: Bump VM images.
-   PR [#&#8203;552](https://togithub.com/numba/llvmlite/issues/552): Add paragraph on installing from sdist and on non-traditional
    platforms.
-   PR [#&#8203;551](https://togithub.com/numba/llvmlite/issues/551): Remove python 2, python &lt; 3.6, fix up, add flake8
-   PR [#&#8203;549](https://togithub.com/numba/llvmlite/issues/549): Miscalled method and missing parameter in the documentation
-   PR [#&#8203;547](https://togithub.com/numba/llvmlite/issues/547): Permit building on Visual Studio 2017
-   PR [#&#8203;543](https://togithub.com/numba/llvmlite/issues/543): Update error message in LLVM version check.
-   PR [#&#8203;540](https://togithub.com/numba/llvmlite/issues/540): update to final release date for 0.31.0

Authors:

-   Arik Funke
-   Eric Larson
-   Jan Vesely
-   Shan Sikdar
-   Siu Kwan Lam  (core dev)
-   Stan Seibert (core dev)
-   Stuart Archibald (core dev)
-   Vladislav Hrčka

</details>

---

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This PR has been generated by [WhiteSource Renovate](https://renovate.whitesourcesoftware.com). View repository job log [here](https://app.renovatebot.com/dashboard#googleapis/python-bigquery).

Co-authored-by: Tres Seaver <[email protected]>

Fixes: #196

* feat(bigquery): add support and tests for struct fields

* feat(bigquery): bump pyarrow version for python3

* feat(bigquery): nit

Co-authored-by: Tres Seaver <[email protected]>
Co-authored-by: Takashi Matsuo <[email protected]>

Closes #217.

* feat(bigquery): add client_options to base class

* chore: bump g-c-c to 1.4.1

Fixes #168.

This PR fixes the problem when converting query results to Pandas with `pyarrow` when data contains timestamps that would fall out of `pyarrow`'s nanoseconds precision.

The fix requires `pyarrow>=1.0.0`, thus it only works on Python 3.

### PR checklist
- [x] Make sure to open an issue as a [bug/issue](https://github.com/googleapis/python-bigquery/issues/new/choose) before writing your code!  That way we can discuss the change, evaluate designs, and agree on the general idea
- [x] Ensure the tests and linter pass
- [x] Code coverage does not decrease (if any source code was changed)
- [x] Appropriate docs were updated (if necessary)

Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>