chore: regenerate README (#599)

This PR was generated using Autosynth. 🌈


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

```
2021-08-09 19:47:25,111 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-datacatalog/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-08-09 19:47:26,421 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/7b27bf13-338c-4625-af6c-9326732047f0/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": "81cf435febc0d1ac26883919c41e5bd402a328dd"
+        "sha": "f011bb35a741e4fbc3297821174d55074d4dd204"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "3d32990b6f4b57be77455e3ca89e6e21cd0c06b3"
+        "sha": "5605f38f153e7627ba4441a2c5181060b664d224"
       }
     }
   ]

README.md

@@ -56,13 +56,13 @@ compile 'com.google.cloud:google-cloud-datacatalog'
 If you are using Gradle without BOM, add this to your dependencies
 
 ```Groovy
-compile 'com.google.cloud:google-cloud-datacatalog:1.4.2'
+compile 'com.google.cloud:google-cloud-datacatalog:1.5.0'
 ```
 
 If you are using SBT, add this to your dependencies
 
 ```Scala
-libraryDependencies += "com.google.cloud" % "google-cloud-datacatalog" % "1.4.2"
+libraryDependencies += "com.google.cloud" % "google-cloud-datacatalog" % "1.5.0"
 ```
 
 ## Authentication