Regenerate client list in README (#8864)

This PR was generated using Autosynth. 🌈


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

```
2021-06-22 04:09:07,606 synthtool [DEBUG] > Executing /home/kbuilder/.cache/synthtool/google-api-java-client-services/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-06-22 04:09:08,032 synthtool [DEBUG] > Cloning https://github.com/googleapis/discovery-artifact-manager.git.
DEBUG:synthtool:Cloning https://github.com/googleapis/discovery-artifact-manager.git.
2021-06-22 04:09:08,434 synthtool [DEBUG] > Cleaning output directory.
DEBUG:synthtool:Cleaning output directory.
2021-06-22 04:09:08,436 synthtool [DEBUG] > Installing dependencies.
DEBUG:synthtool:Installing dependencies.
removing unused service versions
2021-06-22 04:09:10,494 synthtool [DEBUG] > Wrote metadata to synth.metadata.
DEBUG:synthtool:Wrote metadata to synth.metadata.

```
</details>

Full log will be available here:
https://source.cloud.google.com/results/invocations/d13863e1-d264-459d-87ff-484ab7a458c1/targets

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README.md

@@ -151,7 +151,7 @@ packages on [Maven Central][maven-search].
 | Google Chat API | [v1](clients/google-api-services-chat/v1) |
 | Google Civic Information API | [v2](clients/google-api-services-civicinfo/v2) |
 | Google Classroom API | [v1](clients/google-api-services-classroom/v1) |
-| Google Cloud Data Catalog API | [v1beta1](clients/google-api-services-datacatalog/v1beta1) |
+| Google Cloud Data Catalog API | [v1](clients/google-api-services-datacatalog/v1), [v1beta1](clients/google-api-services-datacatalog/v1beta1) |
 | Google Cloud Memorystore for Redis API | [v1](clients/google-api-services-redis/v1), [v1beta1](clients/google-api-services-redis/v1beta1) |
 | Google Cloud Translation API | [v2](clients/google-api-services-translate/v2) |
 | Google Docs API | [v1](clients/google-api-services-docs/v1) |