Cogeo-mosaic

* update rio-tiler version dependencies
* update pygeos dependency to >=0.10 which fix https://github.com/developmentseed/cogeo-mosaic/issues/81

**breaking**

* `gzip` is now only applied if the path endswith `.gz`
* remove `backend_options` attribute in base backends. This attribute was used to pass optional `gzip` option and/or STAC related options
* STAC backends has additional attributes (`stac_api_options` and `mosaic_options`)

* add `SQLite` backend (https://github.com/developmentseed/cogeo-mosaic/pull/148)
* fix cached responsed after updating a mosaic (https://github.com/developmentseed/cogeo-mosaic/pull/148/files#r557020660)
* update mosaicJSON.bounds type definition to match rio-tiler BaseReader definition (https://github.com/developmentseed/cogeo-mosaic/issues/158)
* add default bounds/minzoom/maxzoom values matching the mosaicjson default in the backends (https://github.com/developmentseed/cogeo-mosaic/pull/162)
* raise an error when trying to pass `mosaic_def` in read-only backend (https://github.com/developmentseed/cogeo-mosaic/pull/162)
* add `MemoryBackend` (https://github.com/developmentseed/cogeo-mosaic/pull/163)

**breaking**

* Updated the backends `.point()` methods to return a list in form of `[(asset1, values)]` (https://github.com/developmentseed/cogeo-mosaic/pull/168)

* remove `overview` command (https://github.com/developmentseed/cogeo-mosaic/issues/71#issuecomment-748265645)
* remove `rio-cogeo` dependencies
* update rio-tiler version (`2.0.0rc4`)

* Update to remove all calls to `rio_tiler.mercator` functions.

* update Backend base class for rio-tiler 2.0.0rc3 (add `.feature()` method)