Attempt to fix travis

.travis.yml

@@ -1,5 +1,8 @@
 language: java
 jdk: oraclejdk8
+before_install:
+  - chmod a+x gradlew
+  - ./gradlew clean
 install: "./gradlew setupCIWorkspace"
 script: "./gradlew build"
 after_success: "./gradlew bintrayUpload"
@@ -11,4 +14,4 @@ cache:
     - $HOME/.gradle/caches/
     - $HOME/.gradle/wrapper/
 notifications:
-  email: false
+  email: false