travis: only create dist if deploying

.travis.yml

@@ -17,13 +17,13 @@ notifications:
       secure: "PWEk4+VL986c3gAjWp12nqyifvxCjBqKoESG9d7zWh1uiTLadTHhZJRMdsye36FCpz/c/Jt7zCRO/5y7FaubQptnRrkrRfjp5f99MJRzQVXnUAM+y385qVkXKRKd/PLpM7XPm4AvjvxHCyvzX2wamRvul/TekaXKB9Ti5FCN87s="
 
 install:
-  -  ./gradlew assemble
+  - ./gradlew assemble
 
 script:
   - ./gradlew check
-  - ./gradlew createZipDistribution
 
 before_deploy:
+  - ./gradlew createZipDistribution
   - export RELEASE_DIST=$(ls build/distributions/*.zip)
 
 deploy: