* changed default level to Low #211
* fixed usage #211
* erased Lang option #195
* changed output credit to contributors #141
* Removed contributor information for uncreated features and features that will not be introduced in v1.0. #141
* removed slack notification feature #202
- removed config option
- removed artifact slack notification call
* removed description of slack notification #202
* fixed default level to Low #211
* removed description about slack notification #202
