github/workflows: test on multiple golang versions

Signed-off-by: Vincent Batts <vbatts@hashbangbash.com>

.github/workflows/go.yml

@@ -10,13 +10,16 @@ jobs:
 
   build:
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        go: ['1.17', '1.18', '1.19', '1.20']
     steps:
     - uses: actions/checkout@v3
 
     - name: Set up Go
       uses: actions/setup-go@v3
       with:
-        go-version: 1.17
+        go-version: ${{ matrix.go }}
 
     - name: Build
       run: make