travis update

.travis.yml

@@ -21,9 +21,12 @@ matrix:
     - env: FLUTTER_VERSION=dev
 
 before_script:
+  - pwd
   - git clone https://github.com/flutter/flutter.git -b $FLUTTER_VERSION
-  - ./flutter/bin/flutter doctor
+  - export PATH=`pwd`/flutter/bin:`pwd`/flutter/bin/cache/dart-sdk/bin:$PATH
+  - flutter doctor
 script:
+  - pwd
   - ./flutter/bin/flutter test --coverage
 after_success:
   - bash <(curl -s https://codecov.io/bash) -t $CODE_COV_TOKEN