[BUG] Incompatible Python and NumPy Versioning

[kamcbk]

Heads up that numpy >=1.20.0 doesn't support Python 3.6. numpy.typing in merger.py was introduced in numpy 1.20.0. Tiler has been failing on any Python 3.6 work I try doing.

The two solutions I see are to remove numpy.typing to allow Python 3.6 to work or update tiler to work 3.7 =<.

[the-lay]

Thank you very much for the bug report!

Python 3.6 is already considered outdated, so the easy solution is to update the minimum required version to 3.7. Even some third-party numpy typing modules like nptyping don't support 3.6. However, since that is the only thing blocking tiler on py3.6, I will see what I can do to make it work.

[kamcbk]

Up to you on whatever versioning you wish to support - I'll adapt accordingly. I would default to whatever Python versions are being supported by the rest of the Python community. A change in requirements, like you mentioned, would be the easiest solution. But it's all your choice.

Figured new users or anyone using older software would be looking at requirements a little more closer.

[cwerner]

FWIW: I also had to fork and remove the nptyping code from merger since my environment is pinned to numpy <1.2 due to other packages.