update travis to not use dart_dev

Author: davidmarne

Diff for: .travis.yml

@@ -10,9 +10,7 @@ before_install:
 
 script:
   - pub run build_runner build --delete-conflicting-outputs
-  - pub run dart_dev format --check
-  - pub run dart_dev analyze
-  - pub run dart_dev test -p vm
-  - pub run dart_dev coverage --no-html
-  - bash <(curl -s https://codecov.io/bash) -f coverage/coverage.lcov
+  - dartfmt -n --set-exit-if-changed lib/
+  - dartanalyzer --fatal-warnings --fatal-infos lib/
+  - pub run build_runner test --delete-conflicting-outputs
   - pub run build_runner test --delete-conflicting-outputs -- -p chrome

Diff for: pubspec.yaml

@@ -18,9 +18,6 @@ dev_dependencies:
   build_runner: ^0.9.0
   build_test: ^0.10.0
   build_web_compilers: ^0.4.0
-  dart_dev: ^1.9.2
-  dart_style: ^1.0.0
-  coverage: ^0.11.0
 
 environment:
   sdk: '>=2-0-0-dev <2.0.0'