chore: regenerate README (#465)

This PR was generated using Autosynth. 🌈 <details><summary>Log from Synthtool</summary> ``` 2021-03-04 19:39:39,411 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-dialogflow/.github/readme/synth.py. On branch autosynth-readme nothing to commit, working tree clean 2021-03-04 19:39:40,376 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/65cc6ce7-0cf3-4473-ada3-3ebffc5b48e4/targets - [ ] To automatically regenerate this PR, check this box.

Author: yoshi-automation

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

@@ -4,7 +4,7 @@
  "git": {
  "name": ".",
  "remote": "https://github.com/googleapis/java-dialogflow.git",
- "sha": "cebe9a42686df7a3eafbdf98f9ed46a890e1ba50"
+ "sha": "b0db749954aa1ae75b580535de4cb9a2ce80a0e9"
  }
  },
  {

README.md

@@ -17,7 +17,7 @@ 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>18.1.0</version>
+ <version>19.0.0</version>
  <type>pom</type>
  <scope>import</scope>
  </dependency>