travis: only deploy master

.travis.yml

@@ -9,13 +9,13 @@ script:
   - hugo
 
 after_success: |
-  if [ -n "$GITHUB_TOKEN" ]; then
+  if [ -n "$GITHUB_TOKEN" ] && [ "$TRAVIS_BRANCH" -eq "master" ]; then
     cd "$TRAVIS_BUILD_DIR"
     cd public
     git init
     git checkout -b master
     git add .
-    git -c user.name='cwpearson' -c user.email='carl.w.pearson@gmail.com' commit -m "push from hugo-cwpearson $TRAVIS_BRANCH $TRAVIS_COMMIT"
+    git -c user.name='cwpearson' -c user.email='carl.w.pearson@gmail.com' commit -m "push from hugo-cwpearson $TRAVIS_COMMIT"
     # Make sure to make the output quiet, or else the API token will leak!
     # This works because the API key can replace your password.
     git push -f -q https://cwpearson:$GITHUB_TOKEN@github.com/cwpearson/cwpearson.github.io master 2> /dev/null