Add StandardJS workflow

Been running these locally only.

.github/workflows/standardjs.yaml

@@ -0,0 +1,17 @@
+name: StandardJS
+on:
+  pull_request:
+    types:
+      - opened
+      - edited
+      - synchronize
+jobs:
+  StandardJS:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v1
+        with:
+          node-version: 12.x
+      - run: npm install standard
+      - run: npx standard