update build.gradle

Author: jriwanek

.travis.yml

@@ -1,12 +1,13 @@
 language: java
+sudo: false
 cache:
   directories:
     - $HOME/.gradle
 notifications:
   email: false
 jdk:
   - oraclejdk8
-install: ./gradlew setupCIWorkspace -S
-script: ./gradlew build -S
 before_install:
   - chmod a+x gradlew
+install: ./gradlew setupCIWorkspace -S
+script: ./gradlew clean build -S