Bump github.com/spf13/viper from 1.6.3 to 1.7.0 (#284)

Bumps [github.com/spf13/viper](https://github.com/spf13/viper) from 1.6.3 to 1.7.0.
- [Release notes](https://github.com/spf13/viper/releases)
- [Commits](spf13/viper@v1.6.3...v1.7.0)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>
Co-authored-by: Mark Phelps <markphelps@github.com>

go.mod

@@ -35,12 +35,11 @@ require (
 	github.com/sirupsen/logrus v1.6.0
 	github.com/spf13/afero v1.2.0 // indirect
 	github.com/spf13/cobra v0.0.7
-	github.com/spf13/viper v1.6.3
+	github.com/spf13/viper v1.7.0
 	github.com/stretchr/testify v1.5.1
 	github.com/urfave/negroni v1.0.0 // indirect
 	golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e
 	golang.org/x/tools v0.0.0-20200422022333-3d57cf2e726e
-	google.golang.org/appengine v1.6.0 // indirect
 	google.golang.org/genproto v0.0.0-20191115221424-83cc0476cb11 // indirect
 	google.golang.org/grpc v1.29.1
 	gopkg.in/yaml.v2 v2.2.8