Deploy to bintray on tags

.travis.yml

   - ./gradlew test
   - ./gradlew codeCoverageReport
 after_success:
-  - bash <(curl -s https://codecov.io/bash)
+  - bash <(curl -s https://codecov.io/bash)
+deploy:
+  provider: script
+  script: ./gradlew clean bintrayUpload
+  on:
+    tags: true
+    jdk: oraclejdk11