Fixed codecov integration

.gitignore

@@ -1 +1,3 @@
 mumbledj*
+coverage.txt
+*.coverprofile

.travis.yml

@@ -9,6 +9,7 @@ go:
 
 before_install:
   - go get github.com/Masterminds/glide
+  - go get github.com/go-playground/overalls
 
 script:
   - make test

Makefile

@@ -7,7 +7,8 @@ mumbledj: ## Default action. Builds MumbleDJ.
 
 .PHONY: test
 test: ## Runs unit tests for MumbleDJ.
-	@env GO15VENDOREXPERIMENT="1" go test $(dirs)
+	@env GO15VENDOREXPERIMENT="1" overalls -project=github.com/matthieugrieger/mumbledj -covermode=atomic
+	@mv overalls.coverprofile coverage.txt
 
 .PHONY: clean
 clean: ## Removes compiled MumbleDJ binaries.