Bump github.com/spf13/viper from 1.3.2 to 1.7.1 (#157)

Bumps [github.com/spf13/viper](https://github.com/spf13/viper) from 1.3.2 to 1.7.1.
- [Release notes](https://github.com/spf13/viper/releases)
- [Commits](spf13/viper@v1.3.2...v1.7.1)

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

go.mod

@@ -40,7 +40,7 @@ require (
 	github.com/spf13/cobra v0.0.4-0.20190321000552-67fc4837d267
 	github.com/spf13/jwalterweatherman v1.1.0 // indirect
 	github.com/spf13/pflag v1.0.3
-	github.com/spf13/viper v1.3.2
+	github.com/spf13/viper v1.7.1
 	github.com/stretchr/testify v1.6.0
 	github.com/tidwall/pretty v1.0.1 // indirect
 	github.com/xdg/stringprep v1.0.0 // indirect