use spf13/viper to process config file. YAML is referenced.
33480fe update readme
bd77c99 WriteConfig
ee96bc3 move the viper sync logic to enging.Config
8fc74a9 prior ConvYAML logic
133565b config default location
dec2efd norm dir logic update
d8546ed add: --conv-yaml arg
d111327 use viper config
