Fix releasing

Travis couldn't find the release artifacts when the path was relative.

Author: tannewt

.travis.yml

@@ -16,7 +16,7 @@ deploy:
   provider: releases
   api_key: $GITHUB_TOKEN
   file_glob: true
-  file: bundles/*
+  file: $TRAVIS_BUILD_DIR/bundles/*
   skip_cleanup: true
   overwrite: true
   on: