Merge pull request #463 from lucas-clemente/lucas-clemente-patch-1

Retry travis builds up to 3 times

.travis.yml

@@ -33,7 +33,8 @@ before_install:
   - go env # for debugging
 
 script:
-  - .travis/script.sh
+  # Retry building up to 3 times as documented here: https://docs.travis-ci.com/user/common-build-problems/#travis_retry
+  - travis_retry .travis/script.sh
 
 after_success:
   - .travis/after_success.sh