fix travis coverall integration

.travis.yml

@@ -1,16 +1,18 @@
 language: go
 go:
 - 1.x
+- tip
 gobuild_args: -x -ldflags "-X main.buildversion=$(git rev-parse HEAD)"
 before_install:
 - sudo apt-get install gcc-mingw-w64 gcc-mingw-w64-i686 gcc-mingw-w64-x86-64 binutils-mingw-w64-i686
   binutils-mingw-w64-x86-64 ansible
 - go get -u github.com/tools/godep
+- go get github.com/mattn/goveralls
 before_script:
 - go vet
 - go test -v ./...
-- go test -v -covermode=count -coverprofile=coverage.out $HOME/gopath/bin/goveralls
-  -coverprofile=coverage.out -service=travis-ci -repotoken $COVERALLS_TOKEN
+script:
+- $HOME/gopath/bin/goveralls -service=travis-ci -repotoken=$COVERALLS_TOKEN
 install:
 - export GOPATH="${TRAVIS_BUILD_DIR}/vendor:$GOPATH"
 - export PATH="${TRAVIS_BUILD_DIR}/Godeps/_workspace/bin:$PATH"