chore(deps): cleanup go.mod a little bit (#136)

* Upgrade docker to v19.03.7

* go mod vendor

* golangci-lint 1.23.8

.github/workflows/push.yml

@@ -6,7 +6,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v2
-    - uses: docker://golangci/golangci-lint:v1.23.6
+    - uses: docker://golangci/golangci-lint:v1.23.8
       with:
         args: golangci-lint run
       env: