Upgrade viper to 1.6.2

Author: rsora

go.mod

@@ -23,7 +23,6 @@ require (
 	github.com/juju/errors v0.0.0-20181118221551-089d3ea4e4d5 // indirect
 	github.com/juju/loggo v0.0.0-20190526231331-6e530bcce5d8 // indirect
 	github.com/juju/testing v0.0.0-20190429233213-dfc56b8c09fc // indirect
-	github.com/kr/pretty v0.1.0 // indirect
 	github.com/mattn/go-colorable v0.1.2
 	github.com/mattn/go-runewidth v0.0.2 // indirect
 	github.com/miekg/dns v1.0.5 // indirect
@@ -34,10 +33,9 @@ require (
 	github.com/schollz/closestmatch v2.1.0+incompatible
 	github.com/segmentio/stats/v4 v4.5.3
 	github.com/sirupsen/logrus v1.4.2
-	github.com/smartystreets/goconvey v0.0.0-20190330032615-68dc04aab96a // indirect
 	github.com/spf13/cobra v0.0.5
 	github.com/spf13/jwalterweatherman v1.0.0
-	github.com/spf13/viper v1.3.2
+	github.com/spf13/viper v1.6.2
 	github.com/stretchr/testify v1.4.0
 	go.bug.st/cleanup v1.0.0
 	go.bug.st/downloader v1.1.0
@@ -51,5 +49,5 @@ require (
 	google.golang.org/grpc v1.27.0
 	gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 // indirect
 	gopkg.in/mgo.v2 v2.0.0-20180705113604-9856a29383ce // indirect
-	gopkg.in/yaml.v2 v2.2.2
+	gopkg.in/yaml.v2 v2.2.4
 )