chore: regenerate README (#516)

This PR was generated using Autosynth. 🌈


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

```
2020-11-17 18:13:26,839 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-bigquerydatatransfer/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working directory clean
2020-11-17 18:13:27,833 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/8139fb7c-f211-44ea-9901-662dd640fe9b/targets

- [ ] To automatically regenerate this PR, check this box.

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

@@ -4,14 +4,14 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-bigquerydatatransfer.git",
-        "sha": "f9b1eaeb1268cb4bd8034ecd919060b30c5deecb"
+        "sha": "6c88965c9fb6f6b9079e03b7b6aa6c466fb8570e"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "e89175cf074dccc4babb4eca66ae913696e47a71"
+        "sha": "7fcc405a579d5d53a726ff3da1b7c8c08f0f2d58"
       }
     }
   ]

README.md

@@ -93,6 +93,7 @@ has instructions for running the samples.
 | Copy Dataset | [source code](https://github.com/googleapis/java-bigquerydatatransfer/blob/master/samples/snippets/src/main/java/com/example/bigquerydatatransfer/CopyDataset.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/CopyDataset.java) |
 | 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 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 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) |