What's Changed
* remove ClassifierRepository from template app by DimaProskurin in https://github.com/salute-developers/smart_app_framework/pull/123
* fix/masking_fields by dangerink in https://github.com/salute-developers/smart_app_framework/pull/121
* Update Diff class by bart0003 in https://github.com/salute-developers/smart_app_framework/pull/114
**Full Changelog**: https://github.com/salute-developers/smart_app_framework/compare/v2.2.0rc3...v2.2.0rc4