Matrix testing

Author: arran

.github/workflows/go.yml

@@ -7,16 +7,19 @@ on:
     branches: 'master'
 
 jobs:
-
   build:
+    strategy:
+      matrix:
+        go-version: [1.16.x]
+        os: [ubuntu-latest, macos-latest, windows-latest]
     name: Build and test
-    runs-on: ubuntu-latest
+    runs-on: ${{ matrix.os }}
     steps:
 
     - name: Set up Go 1.x
       uses: actions/setup-go@v2
       with:
-        go-version: ^1.13
+        go-version: ${{ matrix.go-version }}
       id: go
 
     - name: Check out code into the Go module directory