Pre Release v0.6.0

Changelog

7ea5e43 feat(cmd): check if config exists in create cmd
ebd90a9 feat(config): check rule argument and flags in Validate
ce0cb98 feat(config): return multiple errors in Validate
2f3b9c4 fix(cmd): check first for dir exists before create hook
d4b960a fix(config)!: remove Validate in GetConfig
7153a46 refactor(cmd)!: unexport cmd call back functions
8038687 refactor(cmd)!: unexport errExitCode constant
500e4a9 refactor(config): update error messages
79edbb8 refactor(hook)!: move hook pkg to internal
3e1341e refactor(lint): move rule validate to separate method
5d1e1f6 refactor(rule): change error message