update dockerclient -> v1.6.6

go.mod

@@ -3,7 +3,7 @@ module github.com/bcicen/ctop
 require (
 	github.com/BurntSushi/toml v0.3.1
 	github.com/c9s/goprocinfo v0.0.0-20170609001544-b34328d6e0cd
-	github.com/fsouza/go-dockerclient v1.4.1
+	github.com/fsouza/go-dockerclient v1.6.6
 	github.com/gizak/termui v2.3.0+incompatible
 	github.com/jgautheron/codename-generator v0.0.0-20150829203204-16d037c7cc3c
 	github.com/mattn/go-runewidth v0.0.0-20170201023540-14207d285c6c // indirect
@@ -13,7 +13,7 @@ require (
 	github.com/op/go-logging v0.0.0-20160211212156-b2cb9fa56473
 	github.com/opencontainers/runc v1.0.0-rc92
 	github.com/pkg/errors v0.9.1
-	github.com/stretchr/testify v1.2.2
+	github.com/stretchr/testify v1.4.0
 )
 
 replace github.com/gizak/termui => github.com/bcicen/termui v0.0.0-20180326052246-4eb80249d3f5