adds publish-package.yml workflow that will npm publish when a releas…

…e is triggered

.github/workflows/publish-package.yml

@@ -0,0 +1,20 @@
+name: Publish Package
+
+on:
+  release:
+    types:
+      - created
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v1
+      - uses: actions/setup-node@v1
+        with:
+          node-version: 8
+      - uses: JS-DevTools/npm-publish@v1
+        with:
+          token: ${{ secrets.NPM_TOKEN }}
+