Checkout Go before running lint (#26)

Copied the other workflow steps.

Signed-off-by: Charlie Le <[email protected]>

.github/workflows/validate_pr.yml

@@ -2,14 +2,18 @@ name: Validate PR
 on:
   pull_request:
     paths-ignore:
-    - 'docs/**'
-    - '*.md'
+      - "docs/**"
+      - "*.md"
 jobs:
   lint:
     name: Lint
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v2
+      - name: Set up Go 1.16
+        uses: actions/setup-go@v1
+        with:
+          go-version: 1.16
       - name: golangci-lint
         uses: golangci/golangci-lint-action@v3
         with: