try multiple go versions

.github/workflows/go.yml

@@ -10,25 +10,24 @@ jobs:
 
   build:
     name: Build
-    runs-on: ubuntu-20.04
-    steps:
+    runs-on: ubuntu-latest
 
-    - name: Set up Go 1.x
+    strategy:
+      matrix:
+        go-version: [^1.15, ^1.16, ^1.17]
+
+    steps:
+    - name: Set up Go ${{ matrix.go-version }}
       uses: actions/setup-go@v2
       with:
-        go-version: ^1.15
-    
+        go-version: ${{ matrix.go-version }}
     - name: Check out code into the Go module directory
       uses: actions/checkout@v2
-
     - name: Get dependencies
       run: cd machinery && go mod download
-
     - name: Build
       run: cd machinery && go build -v ./...
-
     - name: Vet
       run: cd machinery && go vet -v ./...
-
     - name: Test
       run: cd machinery && go test -v ./...