Adding CircleCI (#54)

Based on the dev meeting we are moving to circleci

.circleci/config.yml

@@ -0,0 +1,30 @@
+version: 2.1
+jobs:
+  lint:
+    docker:
+      - image: circleci/golang:1.12-node
+
+    working_directory: /go/src/github.com/mattermost/mattermost-plugin-github
+    steps:
+      - checkout
+
+      - run: curl https://raw.githubusercontent.com/golang/dep/master/install.sh | sh
+      - run: make check-style
+
+  test:
+    docker:
+      - image: circleci/golang:1.12-node
+
+    working_directory: /go/src/github.com/mattermost/mattermost-plugin-github
+    steps:
+      - checkout
+
+      - run: curl https://raw.githubusercontent.com/golang/dep/master/install.sh | sh
+      - run: make test
+
+workflows:
+  version: 2
+  untagged-build:
+    jobs:
+      - lint
+      - test

Makefile

@@ -49,7 +49,9 @@ endif
 govet:
 ifneq ($(HAS_SERVER),)
 	@echo Running govet
-	@$(GO) vet $$(go list ./server/...) || exit 1
+	$(GO) get golang.org/x/tools/go/analysis/passes/shadow/cmd/shadow
+	$(GO) vet $$(go list ./server/...)
+	$(GO) vet -vettool=$(GOPATH)/bin/shadow $$(go list ./server/...)
 	@echo Govet success
 endif
 

README.md

@@ -1,4 +1,4 @@
-# Mattermost GitHub Plugin [![Build Status](https://travis-ci.org/mattermost/mattermost-plugin-github.svg?branch=master)](https://travis-ci.org/mattermost/mattermost-plugin-github)
+# Mattermost GitHub Plugin ![CircleCI branch](https://img.shields.io/circleci/project/github/mattermost/mattermost-plugin-github/master.svg)
 
 A GitHub plugin for Mattermost. The plugin is currently in beta.