chore: regenerate README (#478)

This PR was generated using Autosynth. 🌈


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

```
2021-04-09 19:26:27,509 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-datacatalog/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-04-09 19:26:28,829 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/1e30dd08-6a76-4045-ad48-ab66991db62e/targets

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

@@ -4,14 +4,14 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-datacatalog.git",
-        "sha": "728586fae5fc6f97e31d307f2b86c22595a8e686"
+        "sha": "899a1be9feabe955d172115203a6ac727cad6c8d"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "a22531f8364582f51485e4e9db85872d93514ab1"
+        "sha": "1f5e6bc8dc8e3661ee550905fc070e55e1b6cea1"
       }
     }
   ]

README.md

@@ -8,6 +8,9 @@ Java idiomatic client for [Data Catalog][product-docs].
 - [Product Documentation][product-docs]
 - [Client Library Documentation][javadocs]
 
+
+
+
 ## Quickstart
 
 If you are using Maven with [BOM][libraries-bom], add this to your pom.xml file