Add GitHub actions (#35)

Author: davimacedo

.github/workflows/release.yml

@@ -0,0 +1,24 @@
+name: release
+on:
+  release:
+    types: [published]
+jobs:
+  publish-npm:
+    runs-on: ubuntu-18.04
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v1
+        with:
+          node-version: '10.14'
+          registry-url: https://registry.npmjs.org/
+      - name: Cache Node.js modules
+        uses: actions/cache@v2
+        with:
+          path: ~/.npm
+          key: ${{ runner.os }}-node-${{ hashFiles('**/package-lock.json') }}
+          restore-keys: |
+              ${{ runner.os }}-node-
+      - run: npm ci
+      - run: npm publish
+        env:
+          NODE_AUTH_TOKEN: ${{secrets.NPM_TOKEN}}

README.md

@@ -1,4 +1,6 @@
 # parse-server-simple-mailgun-adapter
+<a href="https://www.npmjs.com/package/@parse/simple-mailgun-adapter"><img alt="npm version" src="https://img.shields.io/npm/v/@parse/simple-mailgun-adapter.svg?style=flat"></a>
+
 Used to send Parse Server password reset and email verification emails though Mailgun
 
 ## Installation