Add npm publish workflow

.github/workflows/bump-version.yaml

@@ -0,0 +1,35 @@
+name: "Bump Version"
+
+on:
+  push:
+    branches:
+      - "master"
+
+jobs:
+  bump-version:
+    name: "Bump Version on master"
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: "Checkout source code"
+        uses: "actions/checkout@v2"
+        with:
+          ref: ${{ github.ref }}
+
+      - name: "cat package.json"
+        run: cat ./package.json
+
+      - name: "Setup Node.js"
+        uses: "actions/setup-node@v1"
+        with:
+          node-version: 12
+
+      - name: "Automated Version Bump"
+        uses: "phips28/gh-action-bump-version@master"
+        with:
+          tag-prefix: ''
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: "cat package.json"
+        run: cat ./package.json

.github/workflows/npm-publish.yaml

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+name: publish
+
+on:
+  release:
+    types: [published]
+
+jobs:
+  npm-publish:
+    name: npm-publish
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@master
+
+    - name: Set up Node.js
+      uses: actions/setup-node@master
+      with:
+        node-version: 10.0.0
+
+    - name: Change directory to package
+      run: cd package
+
+    - name: Install dependencies
+      run: yarn install
+
+    - name: Build
+      run: yarn build
+
+    - name: Publish to npm
+      uses: JS-DevTools/npm-publish@v1
+      with:
+        token: ${{ secrets.NPM_TOKEN }}
+
+    - if: steps.publish.type != 'none'
+      run: |
+        echo "Version changed: ${{ steps.publish.outputs.old-version }} => ${{ steps.publish.outputs.version }}"