Merge pull request #160 from cutenode/bnb/github-ci-xplat-attempt

chore: First attempt at adding xplat GitHub CI

Author: bnb

.github/workflows/ci.yml

@@ -1,23 +1,21 @@
-name: Node.js CI
+name: Node.js Cross-platform CI
 
 on: [push]
 
 jobs:
   build:
-
-    runs-on: ubuntu-latest
-
+    runs-on: ${{ matrix.os }}
     strategy:
       matrix:
+        os: [ubuntu-latest, windows-latest, macOS-latest]
         node-version: [8.x, 10.x, 12.x]
-
     steps:
     - uses: actions/checkout@v1
-    - name: Use Node.js ${{ matrix.node-version }}
+    - name: Use Node.js ${{ matrix.node-version }} on ${{ matrix.os }}
       uses: actions/setup-node@v1
       with:
         node-version: ${{ matrix.node-version }}
-    - name: npm install, build, and test
+    - name: npm install and test
       run: |
         npm install
         npm test