One step for 1.12, one step for 1.13

.github/workflows/go.yml

@@ -1,24 +1,34 @@
 name: Go
 on: [push]
 jobs:
-
-  build:
-    name: Build
+  build-1.12:
+    name: Build with Go 1.12
     runs-on: ubuntu-latest
     steps:
-
-    - name: Set up Go 1.13
+    - name: Set up Go 1.12
       uses: actions/setup-go@v1
       with:
-        go-version: 1.13
+        go-version: 1.12
       id: go
-
     - name: Check out code into the Go module directory
       uses: actions/checkout@v1
-      
     - name: Test
       run: go test -mod vendor ./...
-
-
     - name: Build
       run: go build -mod vendor
+
+  build-1.13:
+    name: Build with Go 1.13
+    runs-on: ubuntu-latest
+    steps:
+      - name: Set up Go 1.13
+        uses: actions/setup-go@v1
+        with:
+          go-version: 1.13
+        id: go
+      - name: Check out code into the Go module directory
+        uses: actions/checkout@v1
+      - name: Test
+        run: go test -mod vendor ./...
+      - name: Build
+        run: go build -mod vendor