Remove race-test command from Makefile

.travis.yml

@@ -22,4 +22,3 @@ script:
   - diff <(goimports -d .) <(echo -n "")
   - make lint
   - make test
-  - make race-test

Makefile

@@ -19,18 +19,14 @@ lint: ## Run golint and go vet.
 	@go vet .
 
 .PHONY: test
-test:  ## Run the tests.
-	@go test .
+test:  ## Run the tests with race condition checking.
+	@go test -race .
 
 .PHONY: coverage
 cover:  ## Run the tests.
 	@go test -coverprofile=coverage.o
 	@go tool cover -func=coverage.o
 
-.PHONY: race-test
-race-test:  ## Checking the race condition.
-	@go test -race .
-
 .PHONY: help
 help: ## Show help text
 	@echo "Commands:"