Improve build speeds (#1056)

Author: SUPERCILEX

.travis.yml

@@ -12,19 +12,14 @@ cache:
     - $HOME/.android/build-cache
 before_install:
   - mkdir "$ANDROID_HOME/licenses" || true
-  - echo -e "\n8933bad161af4178b1185d1a37fbf41ea5269c55" > "$ANDROID_HOME/licenses/android-sdk-license"
-  - echo -e "\n84831b9409646a918e30573bab4c9c91346d8abd" > "$ANDROID_HOME/licenses/android-sdk-preview-license"
+  - echo -e "\n8933bad161af4178b1185d1a37fbf41ea5269c55\nd56f5187479451eabf01fb78af6dfcb131a6481e" > "$ANDROID_HOME/licenses/android-sdk-license"
+  - echo -e "\n84831b9409646a918e30573bab4c9c91346d8abd\n504667f4c0de7af1a06de9f4b1727b84351f2910" > "$ANDROID_HOME/licenses/android-sdk-preview-license"
 android:
   components:
     # https://github.com/travis-ci/travis-ci/issues/6040#issuecomment-219367943
     - tools
     - tools
-    - platform-tools
-    - android-26
-    - build-tools-26.0.1
-before_script:
-  - mv library/google-services.json app/google-services.json
-  - echo y | ${ANDROID_HOME}tools/bin/sdkmanager --channel=3 "tools" "platform-tools" "build-tools;26.0.2" "platforms;android-26"
+before_script: mv library/google-services.json app/google-services.json
 script: ./gradlew clean assembleDebug check
 after_failure:
   # tests

constants.gradle

@@ -9,6 +9,6 @@ project.ext {
     minSdk = 14
 
     firebaseVersion = '11.6.2'
-    supportLibraryVersion = '27.0.1'
+    supportLibraryVersion = '27.0.2'
     architectureVersion = '1.0.0'
 }