build: enable coverage as part of travis-ci.

.travis.yml

@@ -5,4 +5,7 @@ go:
 
 go_import_path: juju.net.nz/x/pipoint
 
-script: make build check
+script: make build && make coverage
+
+after_success:
+    - bash <(curl -s https://codecov.io/bash)

Makefile

@@ -30,9 +30,13 @@ watch:
 run: build
 	$(GOPATH)/bin/pipoint
 
-check test:
+check:
 	go get -t $(PKG)
-	go test -v $(PKG)
+	go test $(PKG)
+
+coverage:
+	go get -t $(PKG)
+	go test -race -coverprofile=coverage.txt -covermode=atomic $(PKG)
 
 push:
 	GOARCH=arm GOARM=7 go get $(LDFLAGS) $(PKG)/pipoint