Pin morecantile dependency to < v3.0.0

[robintw]

There have been some major changes in morecantile in version 3.0.0 (see https://github.com/developmentseed/morecantile/issues/620). This means that morecantile has switched to using CRS objects from pyproj rather than CRS objects from rasterio.

This was causing titiler to fail when installed with morecantile 3.0.0 - which was happening automatically when I created a new environment and just installed titiler, because there was no version specification in the setup.py.

This PR adds a version spec to the dependency, ensuring that morecantile stays below version 3.0.0.

(I did also try pinning morecantile to at least version 3.0.0, and updating the titiler code to use the pyproj CRS objects - but i got warnings from pip that various other packages had pinned morecantile to <3.0.0, so it's probably best to stick with that for the moment.)

[vincentsarago]

(I did also try pinning morecantile to at least version 3.0.0, and updating the titiler code to use the pyproj CRS objects - but i got warnings from pip that various other packages had pinned morecantile to <3.0.0, so it's probably best to stick with that for the moment.)

Yes that won't work because rio-tiler 2.0, rio-cogeo 2.0 and cogeo-mosaic require morecantile <3.0

We've release rio-cogeo 3.0 which depends on morecantile>=3.0 but rio-tiler will come later cogeotiff/rio-tiler#426