update travis

Author: bin456789

.travis.yml

@@ -11,6 +11,9 @@ android:
     - build-tools-27.0.3
     - android-27
 
+before_install:
+  - yes | sdkmanager "platforms;android-27"
+
 script:
   - if [[ "${TRAVIS_PULL_REQUEST}" = "false" ]]; then
         openssl aes-256-cbc -K $encrypted_3327ea27a2f5_key -iv $encrypted_3327ea27a2f5_iv -in Bin.jks.enc -out Bin.jks -d;