chore: release 0.3.9

[release-please]

🤖 I have created a release *beep* *boop*

0.3.9 (2021-01-14)

Dependencies

• update dependency com.google.cloud:google-cloud-shared-dependencies to v0.18.0 (#317) (cf0c350)
• update dependency com.google.cloud:google-cloud-storage to v1.113.9 (#318) (e8c12b1)

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[codecov]

Codecov Report

Merging #319 (1d5f304) into master (cf0c350) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #319   +/-   ##
=========================================
  Coverage     68.58%   68.58%           
  Complexity      122      122           
=========================================
  Files            18       18           
  Lines           850      850           
  Branches          4        4           
=========================================
  Hits            583      583           
  Misses          259      259           
  Partials          8        8           

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[yoshi-approver]

Rubber stamped release!

[yoshi-automation]

Release is at https://github.com/googleapis/java-document-ai/releases/tag/v0.3.9

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