chore(travis): add code coverage report and tip go version

.travis.yml

@@ -1,12 +1,19 @@
 language: go
 
 go:
-- 1.x
+  - 1.x
+  - tip
+
+script:
+  - make travis
+
+after_success:
+  - bash <(curl -s https://codecov.io/bash)
 
 deploy:
-- provider: script
-  skip_cleanup: true
-  script: curl -sL https://git.io/goreleaser | bash
-  on:
-    tags: true
-    condition: $TRAVIS_OS_NAME = linux
+  - provider: script
+    skip_cleanup: true
+    script: curl -sL https://git.io/goreleaser | bash
+    on:
+      tags: true
+      condition: $TRAVIS_OS_NAME = linux

Makefile

@@ -12,6 +12,10 @@ build: fmt
 test: fmt
 	go list -mod=vendor $(TEST) | xargs -t -n4 go test $(TESTARGS) -mod=vendor -timeout=2m -parallel=4
 
+.PHONY: travis
+travis:
+	go test -race -coverprofile=coverage.txt -covermode=atomic -mod=vendor $(TEST)
+
 .PHONY: cover
 cover:
 	go test $(TEST) -coverprofile=coverage.out