Cleanup travis script (#323)

* try

* try

* more cleanup

* remove explicit jdk

Author: e7mac

.travis.yml

@@ -3,30 +3,13 @@ android:
   components:
     - tools
     - platform-tools
-
     - build-tools-28.0.3
     - android-28
 
-    - extra-google-google_play_services
-    - extra-google-m2repository
-    - extra-android-m2repository
-
-jdk:
-  - oraclejdk8
-
 before_install:
   - sudo wget "https://bouncycastle.org/download/bcprov-ext-jdk15on-160.jar" -O "${JAVA_HOME}/jre/lib/ext/bcprov-ext-jdk15on-160.jar"
   - sudo echo "security.provider.11=org.bouncycastle.jce.provider.BouncyCastleProvider" | sudo tee -a ${JAVA_HOME}/jre/lib/security/java.security
 
-cache:
-  directories:
-    - $HOME/.gradle/caches/
-    - $HOME/.gradle/wrapper/
-    - $HOME/.android/build-cache
-
-  before_install:
-    - java -v
-
 script:
   - make testSDK