Bump github.com/spf13/viper from 1.1.0 to 1.7.1

Bumps [github.com/spf13/viper](https://github.com/spf13/viper) from 1.1.0 to 1.7.1.
- [Release notes](https://github.com/spf13/viper/releases)
- [Commits](spf13/viper@v1.1.0...v1.7.1)

Signed-off-by: dependabot[bot] <[email protected]>

go.mod

@@ -3,29 +3,16 @@ module github.com/instrumenta/kubeval
 go 1.15
 
 require (
-	github.com/BurntSushi/toml v0.3.1 // indirect
 	github.com/fatih/color v1.7.0
-	github.com/fsnotify/fsnotify v1.4.7 // indirect
-	github.com/hashicorp/errwrap v0.0.0-20180715044906-d6c0cd880357 // indirect
-	github.com/hashicorp/go-multierror v0.0.0-20180717150148-3d5d8f294aa0
-	github.com/hashicorp/hcl v0.0.0-20180404174102-ef8a98b0bbce // indirect
+	github.com/hashicorp/go-multierror v1.0.0
 	github.com/inconshreveable/mousetrap v1.0.0 // indirect
-	github.com/magiconair/properties v1.8.0 // indirect
 	github.com/mattn/go-colorable v0.1.0 // indirect
 	github.com/mattn/go-isatty v0.0.4 // indirect
-	github.com/mitchellh/mapstructure v0.0.0-20180715050151-f15292f7a699 // indirect
-	github.com/pelletier/go-toml v0.0.0-20180724185102-c2dbbc24a979 // indirect
-	github.com/spf13/afero v1.1.1 // indirect
-	github.com/spf13/cast v1.2.0 // indirect
 	github.com/spf13/cobra v0.0.0-20180820174524-ff0d02e85550
-	github.com/spf13/jwalterweatherman v0.0.0-20180814060501-14d3d4c51834 // indirect
-	github.com/spf13/pflag v0.0.0-20180821114517-d929dcbb1086 // indirect
-	github.com/spf13/viper v1.1.0
+	github.com/spf13/viper v1.7.1
 	github.com/stretchr/testify v1.3.0
 	github.com/xeipuuv/gojsonpointer v0.0.0-20180127040702-4e3ac2762d5f // indirect
 	github.com/xeipuuv/gojsonreference v0.0.0-20180127040603-bd5ef7bd5415 // indirect
 	github.com/xeipuuv/gojsonschema v0.0.0-20180816142147-da425ebb7609
-	golang.org/x/sys v0.0.0-20180821044426-4ea2f632f6e9 // indirect
-	golang.org/x/text v0.0.0-20180810153555-6e3c4e7365dd // indirect
 	sigs.k8s.io/yaml v1.2.0
 )