update go version

Author: bkielbasa

.github/workflows/go.yml

@@ -25,7 +25,7 @@ jobs:
     - name: Set up Go 1.x
       uses: actions/setup-go@v2
       with:
-        go-version: ^1.13
+        go-version: ^1.20
       id: go
 
     - name: Check out code into the Go module directory
@@ -35,8 +35,6 @@ jobs:
       run: |
         go test -race -covermode atomic -coverprofile=covprofile ./...
     - name: Install goveralls
-      env:
-        GO111MODULE: off
       run: go get github.com/mattn/goveralls
     - name: Send coverage
       env: