Add New Helpers and Convertors

What's Changed

• add ) to convertNumbers document by @HassanHelfi in #150
• Add Converter trait by @hos3ein in #155
• Removed duplicated line by @DRSDavidSoft in #156
• Add new converter methods by @hos3ein in #160
• Add New Methods: subDay, getLastWeek, addDay, getLastMonth by @majidalaeinia in #157

New Contributors

• @HassanHelfi made their first contribution in #150
• @hos3ein made their first contribution in #155
• @DRSDavidSoft made their first contribution in #156
• @majidalaeinia made their first contribution in #157

Full Changelog: v3.4.0...v3.4.1