Updated buildtools

Author: Jorge Costa

.travis.yml

@@ -23,7 +23,7 @@ env:
  global:
  - ANDROID_API=26
  - EMULATOR_API=22
- - ANDROID_BUILD_TOOLS=26.0.2
+ - ANDROID_BUILD_TOOLS=26.0.1
  - ADB_INSTALL_TIMEOUT=5 # minutes
  - ANDROID_ABI=armeabi-v7a
  - ANDROID_TAG=google_apis