Bump github.com/spf13/viper from 1.6.2 to 1.7.1 (#17)

Bumps [github.com/spf13/viper](https://github.com/spf13/viper) from 1.6.2 to 1.7.1.
- [Release notes](https://github.com/spf13/viper/releases)
- [Commits](spf13/viper@v1.6.2...v1.7.1)

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

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

Author: dependabot-preview[bot]

go.mod

@@ -3,15 +3,15 @@ module github.com/polyrabbit/my-token
 go 1.12
 
 require (
-	github.com/fatih/color v0.0.0-20180213133403-507f6050b856
+	github.com/fatih/color v1.7.0
 	github.com/gosuri/uilive v0.0.4
-	github.com/mattn/go-colorable v0.0.0-20180310133214-efa589957cd0
+	github.com/mattn/go-colorable v0.0.9
 	github.com/mattn/go-isatty v0.0.12 // indirect
 	github.com/mattn/go-runewidth v0.0.8 // indirect
 	github.com/olekukonko/tablewriter v0.0.0-20180506121414-d4647c9c7a84
 	github.com/preichenberger/go-coinbasepro/v2 v2.0.5
 	github.com/sirupsen/logrus v1.4.2
 	github.com/spf13/pflag v1.0.5
-	github.com/spf13/viper v1.6.2
+	github.com/spf13/viper v1.7.1
 	github.com/tidwall/gjson v1.6.0
 )