Add coveralls support
diff --git a/.travis.yml b/.travis.yml
index fa3c759..ef2fd49 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -17,6 +17,9 @@
 before_script:
   - test -z "$(git status --porcelain)" || (git status && echo Error Working directory is not clean. Forget to commit generated files? && false)
 
+after_success:
+  - ./gradlew :grpc-all:coveralls
+
 jdk:
   - oraclejdk8