chore: regenerate README (#452)

This PR was generated using Autosynth. 🌈 <details><summary>Log from Synthtool</summary> ``` 2021-04-13 01:04:23,024 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-datalabeling/.github/readme/synth.py. On branch autosynth-readme nothing to commit, working tree clean 2021-04-13 01:04:24,175 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/4afe01cd-5ce8-4ea4-8106-9ec6c6a451fe/targets - [ ] To automatically regenerate this PR, check this box. (May take up to 24 hours.)

Author: yoshi-automation

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

@@ -4,14 +4,14 @@
  "git": {
  "name": ".",
  "remote": "https://github.com/googleapis/java-datalabeling.git",
- "sha": "9a7ea30b0db52c5b829c34314745d781b5b504e8"
+ "sha": "89b5c1cc1587eff1d03c501f40158106693869bd"
  }
  },
  {
  "git": {
  "name": "synthtool",
  "remote": "https://github.com/googleapis/synthtool.git",
- "sha": "d9ddac83a22a600dd33854c9d835a4fe52284207"
+ "sha": "082e1ca0863b13ada8594fe91845380765da5b70"
  }
  }
  ]

README.md

@@ -20,7 +20,7 @@ If you are using Maven with [BOM][libraries-bom], add this to your pom.xml file
  <dependency>
  <groupId>com.google.cloud</groupId>
  <artifactId>libraries-bom</artifactId>
- <version>19.2.1</version>
+ <version>20.0.0</version>
  <type>pom</type>
  <scope>import</scope>
  </dependency>
@@ -48,7 +48,7 @@ If you are using Maven without BOM, add this to your dependencies:
 
 If you are using Gradle 5.x or later, add this to your dependencies
 ```Groovy
-implementation platform('com.google.cloud:libraries-bom:19.2.1')
+implementation platform('com.google.cloud:libraries-bom:20.0.0')
 
 compile 'com.google.cloud:google-cloud-datalabeling'
 ```