Update Go to 1.16

.github/workflows/build.yml

@@ -14,10 +14,10 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 5
     steps:
-      - name: Set up Go 1.15
+      - name: Set up Go
         uses: actions/setup-go@v2
         with:
-          go-version: 1.15
+          go-version: 1.16
       - name: Check out code into the Go module directory
         uses: actions/checkout@v2
       - name: Build binary to make sure it works