Update module github.com/spf13/viper to v1.16.0

vendor/github.com/fsnotify/fsnotify/mkdoc.zsh

vendor/github.com/fsnotify/fsnotify/system_bsd.go

vendor/github.com/fsnotify/fsnotify/system_darwin.go

vendor/github.com/magiconair/properties/.travis.yml

vendor/github.com/magiconair/properties/CHANGELOG.md

vendor/github.com/magiconair/properties/LICENSE.md

vendor/github.com/magiconair/properties/README.md

vendor/github.com/magiconair/properties/decode.go

vendor/github.com/magiconair/properties/doc.go

vendor/github.com/magiconair/properties/integrate.go

vendor/github.com/magiconair/properties/lex.go

vendor/github.com/magiconair/properties/load.go

vendor/github.com/magiconair/properties/parser.go

vendor/github.com/magiconair/properties/properties.go

vendor/github.com/magiconair/properties/rangecheck.go

vendor/github.com/mitchellh/mapstructure/.travis.yml

vendor/github.com/mitchellh/mapstructure/CHANGELOG.md

vendor/github.com/mitchellh/mapstructure/decode_hooks.go

vendor/github.com/mitchellh/mapstructure/mapstructure.go

vendor/github.com/pelletier/go-toml/.travis.yml