Evaluate coveralls-maven-plugin

[tmatsuo]

https://github.com/trautonen/coveralls-maven-plugin

[tswast]

I believe we are now using this plugin.

java-docs-samples/java-repo-tools/pom.xml

Line 80 in d5d8f2b

<artifactId>coveralls-maven-plugin</artifactId>

[tswast]

https://coveralls.io/github/GoogleCloudPlatform/java-docs-samples