Feat
- **redactor**: added special_entities to redactor
- **special_entities**: added redact_special_matches
- **special_entities**: postcodes implemented with tests
- **special_entities**: refacted to support multiple regex matches, and refactored tests
- **SpecialMatch**: added match, and wrote test for find_nhs_number
- **special_entities.py**: added special_entities.py and functions to find nhs numbers and replace in text
- **support_classes.py**: Added support_classes and SpecialMatch
- **support.py**: added is_nhs_number check
Refactor
- **special_entities**: renamed redact_special_matches to redact_special_entities