Fastapi-restful

* Add more pypi classifiers

** Breaking change **
* Remove support to python < 3.6.2

Additionals:
* Multiple version bumps
* Add usage of **kwargs for to allow more options when including new router

* [CVE-2021-29510](https://github.com/samuelcolvin/pydantic/security/advisories/GHSA-5jqp-qgf6-3pvh) fix of pydantic - update is required
* Made sqlalchemy as extras installs

* Add support for Python 3.9 :)
* Fix case of duplicate routes when cbv used with prefix. (As mentioned in [36](https://github.com/yuval9313/FastApi-RESTful/pull/36))
* Made repeatable task pre activate (`wait_first`) to be float instead of boolean (Mentioned here [45](https://github.com/yuval9313/FastApi-RESTful/pull/45))

* Another docs fix
* Rename package folder to small casing to ease imports

* Mostly docs fixes