Update module github.com/spf13/viper to v1.18.1

go.mod

@@ -4,18 +4,10 @@ go 1.15
 
 require (
 	github.com/aws/aws-sdk-go v1.38.38
-	github.com/fsnotify/fsnotify v1.4.9 // indirect
-	github.com/magiconair/properties v1.8.5 // indirect
 	github.com/mitchellh/go-homedir v1.1.0
-	github.com/mitchellh/mapstructure v1.4.1 // indirect
 	github.com/pelletier/go-toml v1.9.1 // indirect
 	github.com/sirupsen/logrus v1.8.1
-	github.com/spf13/afero v1.6.0 // indirect
-	github.com/spf13/cast v1.3.1 // indirect
 	github.com/spf13/cobra v1.1.3
 	github.com/spf13/jwalterweatherman v1.1.0
-	github.com/spf13/viper v1.7.1
-	golang.org/x/sys v0.0.0-20210511113859-b0526f3d8744 // indirect
-	golang.org/x/text v0.3.6 // indirect
-	gopkg.in/ini.v1 v1.62.0 // indirect
+	github.com/spf13/viper v1.18.1
 )