build: travis fix typo double double quote

.travis.yml

@@ -56,4 +56,4 @@ before_install:
 
 after_success:
   - '[ "$TRAVIS_BRANCH" == "master" ] && [ "$TRAVIS_PULL_REQUEST" == "false" ] && ./gradlew uploadArchives || :'
-  - '[ -n "$TRAVIS_TAG"" ] && [ "$TRAVIS_PULL_REQUEST" == "false" ] && ./gradlew bintrayUpload || :'
+  - '[ -n "$TRAVIS_TAG" ] && [ "$TRAVIS_PULL_REQUEST" == "false" ] && ./gradlew bintrayUpload || :'