chore: regenerate README (#540)

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<details><summary>Log from Synthtool</summary>

```
2020-11-23 17:36:37,569 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-bigquerydatatransfer/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working directory clean
2020-11-23 17:36:38,484 synthtool [DEBUG] > Wrote metadata to .github/readme/synth.metadata/synth.metadata.

```
</details>

Full log will be available here:
https://source.cloud.google.com/results/invocations/fc5ccbd4-e1f3-4d8b-a895-1ea2620ab8e1/targets

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Author: yoshi-automation

.github/readme/synth.metadata/synth.metadata

@@ -4,7 +4,7 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-bigquerydatatransfer.git",
-        "sha": "95f5a9cd2949bc8d382c704a3bc357b99a90364e"
+        "sha": "18e069fd0dc437ba5254a6b412bad91bfc9b7a5f"
       }
     },
     {

README.md

@@ -38,7 +38,7 @@ If you are using Maven without BOM, add this to your dependencies:
 <dependency>
   <groupId>com.google.cloud</groupId>
   <artifactId>google-cloud-bigquerydatatransfer</artifactId>
-  <version>1.0.19</version>
+  <version>1.0.20</version>
 </dependency>
 
 ```
@@ -96,10 +96,13 @@ has instructions for running the samples.
 | Create Amazon S3 Transfer | [source code](https://github.com/googleapis/java-bigquerydatatransfer/blob/master/samples/snippets/src/main/java/com/example/bigquerydatatransfer/CreateAmazonS3Transfer.java) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/java-bigquerydatatransfer&page=editor&open_in_editor=samples/snippets/src/main/java/com/example/bigquerydatatransfer/CreateAmazonS3Transfer.java) |
 | Create Campaignmanager Transfer | [source code](https://github.com/googleapis/java-bigquerydatatransfer/blob/master/samples/snippets/src/main/java/com/example/bigquerydatatransfer/CreateCampaignmanagerTransfer.java) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/java-bigquerydatatransfer&page=editor&open_in_editor=samples/snippets/src/main/java/com/example/bigquerydatatransfer/CreateCampaignmanagerTransfer.java) |
 | Create Cloud Storage Transfer | [source code](https://github.com/googleapis/java-bigquerydatatransfer/blob/master/samples/snippets/src/main/java/com/example/bigquerydatatransfer/CreateCloudStorageTransfer.java) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/java-bigquerydatatransfer&page=editor&open_in_editor=samples/snippets/src/main/java/com/example/bigquerydatatransfer/CreateCloudStorageTransfer.java) |
+| Create Play Transfer | [source code](https://github.com/googleapis/java-bigquerydatatransfer/blob/master/samples/snippets/src/main/java/com/example/bigquerydatatransfer/CreatePlayTransfer.java) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/java-bigquerydatatransfer&page=editor&open_in_editor=samples/snippets/src/main/java/com/example/bigquerydatatransfer/CreatePlayTransfer.java) |
 | Create Redshift Transfer | [source code](https://github.com/googleapis/java-bigquerydatatransfer/blob/master/samples/snippets/src/main/java/com/example/bigquerydatatransfer/CreateRedshiftTransfer.java) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/java-bigquerydatatransfer&page=editor&open_in_editor=samples/snippets/src/main/java/com/example/bigquerydatatransfer/CreateRedshiftTransfer.java) |
 | Create Scheduled Query | [source code](https://github.com/googleapis/java-bigquerydatatransfer/blob/master/samples/snippets/src/main/java/com/example/bigquerydatatransfer/CreateScheduledQuery.java) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/java-bigquerydatatransfer&page=editor&open_in_editor=samples/snippets/src/main/java/com/example/bigquerydatatransfer/CreateScheduledQuery.java) |
 | Create Scheduled Query With Service Account | [source code](https://github.com/googleapis/java-bigquerydatatransfer/blob/master/samples/snippets/src/main/java/com/example/bigquerydatatransfer/CreateScheduledQueryWithServiceAccount.java) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/java-bigquerydatatransfer&page=editor&open_in_editor=samples/snippets/src/main/java/com/example/bigquerydatatransfer/CreateScheduledQueryWithServiceAccount.java) |
 | Create Teradata Transfer | [source code](https://github.com/googleapis/java-bigquerydatatransfer/blob/master/samples/snippets/src/main/java/com/example/bigquerydatatransfer/CreateTeradataTransfer.java) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/java-bigquerydatatransfer&page=editor&open_in_editor=samples/snippets/src/main/java/com/example/bigquerydatatransfer/CreateTeradataTransfer.java) |
+| Create Youtube Channel Transfer | [source code](https://github.com/googleapis/java-bigquerydatatransfer/blob/master/samples/snippets/src/main/java/com/example/bigquerydatatransfer/CreateYoutubeChannelTransfer.java) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/java-bigquerydatatransfer&page=editor&open_in_editor=samples/snippets/src/main/java/com/example/bigquerydatatransfer/CreateYoutubeChannelTransfer.java) |
+| Create Youtube Content Owner Transfer | [source code](https://github.com/googleapis/java-bigquerydatatransfer/blob/master/samples/snippets/src/main/java/com/example/bigquerydatatransfer/CreateYoutubeContentOwnerTransfer.java) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/java-bigquerydatatransfer&page=editor&open_in_editor=samples/snippets/src/main/java/com/example/bigquerydatatransfer/CreateYoutubeContentOwnerTransfer.java) |
 | Delete Scheduled Query | [source code](https://github.com/googleapis/java-bigquerydatatransfer/blob/master/samples/snippets/src/main/java/com/example/bigquerydatatransfer/DeleteScheduledQuery.java) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/java-bigquerydatatransfer&page=editor&open_in_editor=samples/snippets/src/main/java/com/example/bigquerydatatransfer/DeleteScheduledQuery.java) |
 | Delete Transfer Config | [source code](https://github.com/googleapis/java-bigquerydatatransfer/blob/master/samples/snippets/src/main/java/com/example/bigquerydatatransfer/DeleteTransferConfig.java) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/java-bigquerydatatransfer&page=editor&open_in_editor=samples/snippets/src/main/java/com/example/bigquerydatatransfer/DeleteTransferConfig.java) |
 | Disable Transfer Config | [source code](https://github.com/googleapis/java-bigquerydatatransfer/blob/master/samples/snippets/src/main/java/com/example/bigquerydatatransfer/DisableTransferConfig.java) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/java-bigquerydatatransfer&page=editor&open_in_editor=samples/snippets/src/main/java/com/example/bigquerydatatransfer/DisableTransferConfig.java) |