chore: regenerate README (#578)

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Author: yoshi-automation

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

@@ -4,7 +4,7 @@
  "git": {
  "name": ".",
  "remote": "https://github.com/googleapis/java-monitoring.git",
- "sha": "b48b2e26381fb5eac05c42c6636e842aac0fdd9e"
+ "sha": "52c00872c3845b0b5375cacedeee2b56aa71bfe0"
  }
  },
  {

README.md

@@ -52,12 +52,12 @@ compile 'com.google.cloud:google-cloud-monitoring'
 ```
 If you are using Gradle without BOM, add this to your dependencies
 ```Groovy
-compile 'com.google.cloud:google-cloud-monitoring:2.3.0'
+compile 'com.google.cloud:google-cloud-monitoring:2.3.1'
 ```
 
 If you are using SBT, add this to your dependencies
 ```Scala
-libraryDependencies += "com.google.cloud" % "google-cloud-monitoring" % "2.3.0"
+libraryDependencies += "com.google.cloud" % "google-cloud-monitoring" % "2.3.1"
 ```
 
 ## Authentication