chore(deps): bump github.com/spf13/viper from 1.6.2 to 1.7.1

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[bot] <support@github.com>

Author: dependabot[bot]

go.mod

@@ -18,13 +18,13 @@ require (
 	github.com/sirupsen/logrus v1.4.1
 	github.com/spf13/cobra v0.0.3
 	github.com/spf13/pflag v1.0.3
-	github.com/spf13/viper v1.6.2
+	github.com/spf13/viper v1.7.1
 	github.com/streadway/amqp v1.0.0
 	github.com/stretchr/testify v1.5.1
 	github.com/valyala/bytebufferpool v1.0.0
 	github.com/valyala/gozstd v1.6.4
 	github.com/xeipuuv/gojsonschema v1.2.0
-	golang.org/x/sys v0.0.0-20190507160741-ecd444e8653b
+	golang.org/x/sys v0.0.0-20190624142023-c5567b49c5d0
 	golang.org/x/text v0.3.2
 	gopkg.in/alexcesaro/quotedprintable.v3 v3.0.0-20150716171945-2caba252f4dc // indirect
 	gopkg.in/gomail.v2 v2.0.0-20160411212932-81ebce5c23df