Postalservice

- Added YJP search

**Full Changelog**: https://github.com/apmnt/postalservice-python/compare/v0.1.4...v0.1.5

- Fix search by category (by implementing it because I forgot to commit)

**Full Changelog**: https://github.com/apmnt/postalservice-python/compare/v0.1.3...v0.1.4

- Added brand queries
- Added category queries

**Full Changelog**: https://github.com/apmnt/postalservice-python/compare/v0.1.2...v0.1.3

- Added support for pagination in all services
- Fixed fril image retrieval
- Changed mercari image retrieval to get full res image

**Full Changelog**: https://github.com/apmnt/postalservice-python/compare/v0.1.1...v0.1.2

- Added get_search_results_async and get_search_results, which return a SearchResults object, to all services
- Possible to now choose between sync and async for searching
- SearchResults now prints itself as a formatted JSON string

**Full Changelog**: https://github.com/apmnt/postalservice-python/compare/v0.1.0-alpha...v0.1.1

- Added Mercari service
- Added Fril service

**Full Changelog**: https://github.com/apmnt/postalservice-python/commits/v0.1.0-alpha