Update tests.yml

Author: bmoffatt

.github/workflows/tests.yml

@@ -9,10 +9,10 @@ jobs:
     name: run tests with code coverage 
     runs-on: ubuntu-latest
     steps:
-      - name: Set up Go 1.13
+      - name: Set up Go 1.16
         uses: actions/setup-go@v1
         with:
-          go-version: 1.13
+          go-version: 1.16
         id: go
 
       - name: Check out code into the Go module directory