chore(ci): semantic-release on success (#221)

With language node_js the semantic-release command should work

.travis.yml

@@ -26,5 +26,5 @@ after_success:
   # run automated release process with semantic-release
   - echo "TRAVIS_BRANCH=$TRAVIS_BRANCH, TRAVIS_EVENT_TYPE=$TRAVIS_EVENT_TYPE, TRAVIS_NODE_VERSION=$TRAVIS_NODE_VERSION"
   - if [[ "$TRAVIS_BRANCH" == "master" && "$TRAVIS_EVENT_TYPE" == "push" && "$TRAVIS_NODE_VERSION" == "12" ]]; then
-      npm run semantic-release;
+      semantic-release;
     fi;