fix(travis): fuck coveralls

.travis.yml

@@ -5,9 +5,4 @@ go:
   - release
   - tip
 before_install:
-  - go get github.com/axw/gocov/gocov
-  - go get github.com/mattn/goveralls
-  - if ! go get code.google.com/p/go.tools/cmd/cover; then go get golang.org/x/tools/cmd/cover; fi
   - curl -s https://raw.githubusercontent.com/lovell/sharp/master/preinstall.sh | sudo bash -
-script:
-    - $HOME/gopath/bin/goveralls -service=travis-ci