Sanic-mongodb-extension

Fixes:
- Updated dependecies to the latest stable release
- Upgrade to umongo v3
- Updated the example in README

Update to the latest compatible versions for Sanic

Fixes:
- Reuploaded sanic-mongodb-extension on PyPI with correct dependencies
- Updated `umongo` and `motor` packages to the latest release

Added:
- Passing connection options for motor_asyncio client ([PR 11](https://github.com/Relrin/sanic-mongodb-extension/pull/11))

Updates:
- Updated README.md
- uMongo changed to the latest release

Updates:
- Updated motor dependency to the latest release (to 1.0.0)

Added:
- The `lazy_umongo` attribute for getting an access to the lazy uMongo instance

Fixed:
- The example in README.rst