remove build script from ci

Author: davidmarne

.travis.yml

@@ -12,7 +12,6 @@ before_script:
   - git clone https://github.com/flutter/flutter.git -b alpha --depth 1
   - ./flutter/bin/flutter doctor
 script:
-  - dart tool/build.dart
   - ./flutter/bin/flutter test --coverage --coverage-path=lcov.info
 after_success:
   - bash <(curl -s https://codecov.io/bash)