Adjust coverage test instructions to use same profile

Author: alextoombs

.travis.yml

@@ -19,15 +19,14 @@ before_install:
   - sudo apt-get update -q
   - sudo apt-get install -y gcc libkrb5-dev
   - go get github.com/mattn/goveralls
-  - go get golang.org/x/tools/cmd/cover
 
 install: true
 
 script:
   - go vet ./...
   - go fmt ./...
   - go test -v -covermode=count -coverprofile=coverage.out
-  - $HOME/gopath/bin/goveralls -service=travis-ci
+  - $HOME/gopath/bin/goveralls -coverprofile=coverage.out -service=travis-ci
   - go test -i -race ./...
   - go test -v -race ./...
   - cd test/