Fix db#get and db#has

QuickMongo v2.0.6 is released 🎉
- db#table() has been deprecated and will be removed in next update. Please switch to db#createModel() instead
- Fixed a bug : db#get used to return null for false values | db#has used to return false for false values which includes false, 0 etc.
- Other minor changes

Docs: https://quickmongo.js.org
GitHub: https://github.com/DevSnowflake/quickmongo
NPM: https://npmjs.com/package/quickmongo