Bump github.com/sirupsen/logrus from 1.3.0 to 1.4.0

Bumps [github.com/sirupsen/logrus](https://github.com/sirupsen/logrus) from 1.3.0 to 1.4.0.
- [Release notes](https://github.com/sirupsen/logrus/releases)
- [Changelog](https://github.com/sirupsen/logrus/blob/master/CHANGELOG.md)
- [Commits](sirupsen/logrus@v1.3.0...v1.4.0)

Signed-off-by: dependabot[bot] <support@dependabot.com>

go.mod

@@ -9,7 +9,7 @@ require (
 	github.com/koding/multiconfig v0.0.0-20171124222453-69c27309b2d7
 	github.com/kr/pretty v0.1.0 // indirect
 	github.com/pkg/errors v0.8.1
-	github.com/sirupsen/logrus v1.3.0
+	github.com/sirupsen/logrus v1.4.0
 	github.com/stretchr/testify v1.3.0
 	golang.org/x/sys v0.0.0-20180907202204-917fdcba135d // indirect
 	gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 // indirect

go.sum

@@ -30,6 +30,8 @@ github.com/sirupsen/logrus v1.2.0 h1:juTguoYk5qI21pwyTXY3B3Y5cOTH3ZUyZCg1v/mihuo
 github.com/sirupsen/logrus v1.2.0/go.mod h1:LxeOpSwHxABJmUn/MG1IvRgCAasNZTLOkJPxbbu5VWo=
 github.com/sirupsen/logrus v1.3.0 h1:hI/7Q+DtNZ2kINb6qt/lS+IyXnHQe9e90POfeewL/ME=
 github.com/sirupsen/logrus v1.3.0/go.mod h1:LxeOpSwHxABJmUn/MG1IvRgCAasNZTLOkJPxbbu5VWo=
+github.com/sirupsen/logrus v1.4.0 h1:yKenngtzGh+cUSSh6GWbxW2abRqhYUSR/t/6+2QqNvE=
+github.com/sirupsen/logrus v1.4.0/go.mod h1:LxeOpSwHxABJmUn/MG1IvRgCAasNZTLOkJPxbbu5VWo=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/objx v0.1.1 h1:2vfRuCMp5sSVIDSqO8oNnWJq7mPa6KVP3iPIwFBuy8A=
 github.com/stretchr/objx v0.1.1/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=