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/go-units/MAINTAINERS

@@ -27,7 +27,7 @@
 
 	[people.akihirosuda]
 	Name = "Akihiro Suda"
-	Email = "suda.akihiro@lab.ntt.co.jp"
+	Email = "akihiro.suda.cz@hco.ntt.co.jp"
 	GitHub = "AkihiroSuda"
 
 	[people.dnephin]