GitHub Actions: Run Go CI on both Ubuntu and Windows (#41)

Author: pkern

.github/workflows/go.yml

@@ -2,16 +2,19 @@ name: Go
 
 on:
   push:
-    branches: [ master ]
+    branches: [master]
   pull_request:
-    branches: [ master ]
+    branches: [master]
   schedule:
     - cron: '0 0 * * 0' # weekly
 
 jobs:
 
   build:
-    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest]
+    runs-on: ${{ matrix.os }}
     steps:
     - uses: actions/checkout@v2