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

* Upgrade docker to v19.03.7

* go mod vendor

* golangci-lint 1.23.8

vendor/github.com/docker/docker/client/plugin_inspect.go

@@ -15,11 +15,11 @@ func (cli *Client) PluginInspectWithRaw(ctx context.Context, name string) (*type
 		return nil, nil, objectNotFoundError{object: "plugin", id: name}
 	}
 	resp, err := cli.get(ctx, "/plugins/"+name+"/json", nil, nil)
+	defer ensureReaderClosed(resp)
 	if err != nil {
 		return nil, nil, wrapResponseError(err, resp, "plugin", name)
 	}
 
-	defer ensureReaderClosed(resp)
 	body, err := ioutil.ReadAll(resp.body)
 	if err != nil {
 		return nil, nil, err