Travis: switch to OpenJDK

.travis.yml

@@ -1,7 +1,7 @@
 sudo: false
 language: android
 jdk:
-  - oraclejdk8
+- openjdk8
 env:
   global:
   - ANDROID=28
@@ -17,11 +17,11 @@ android:
   - build-tools-$ANDROID_BUILD_TOOLS
   - android-$ANDROID
 before_install:
-  - yes | sdkmanager "platforms;android-$ANDROID"
+- yes | sdkmanager "platforms;android-$ANDROID"
 script:
-  - ./gradlew clean build
+- ./gradlew clean build
 after_success:
-  - if [ "$TRAVIS_BRANCH" == "master" ] && [ "$TRAVIS_PULL_REQUEST" == "false" ]; then
+- if [ "$TRAVIS_BRANCH" == "master" ] && [ "$TRAVIS_PULL_REQUEST" == "false" ]; then
   ./gradlew uploadArchives -PSONATYPE_USERNAME="${SONATYPE_USERNAME}" -PSONATYPE_PASSWORD="${SONATYPE_PASSWORD}";
   fi
 notifications: