better build naming

Author: mauricedoepke

.travis.yml

@@ -14,7 +14,7 @@ after_success:
   - git config --global user.name "Travis CI"
   - git checkout -b dist
   - git add -f "dist/*"
-  - git commit -m "Travis Build - $TRAVIS_BUILD_NUMBER" -m "[skip ci]"
+  - git commit -m "Travis Build - TRAVIS_COMMIT" -m "[skip ci]"
   - git remote rm origin
   - git remote add origin https://mauricedoepke:${GH_TOKEN}@github.com/mauricedoepke/webpack-obfuscator.git > /dev/null 2>&1
   - git push origin dist:master