FIX: Update pyproj min version to 3.0.0

[bzah]

• [x] Closes #486
• [ ] Tests added
• [ ] Tests passed
• [ ] Passes git diff origin/main **/*py | flake8 --diff
• [ ] Fully documented

This PR update the min version of pyproj to 3.0 as pyresample relies on it already.

The only test that I did was to manually install pyproj 3.0 and to make sure import pyresample does throw an error.

[codecov[bot]]

Codecov Report

Merging #487 (20d1b4a) into main (35782d0) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #487   +/-   ##
=======================================
  Coverage   94.32%   94.32%           
=======================================
  Files          74       74           
  Lines       12890    12890           
=======================================
  Hits        12159    12159           
  Misses        731      731           

Flag	Coverage Δ
unittests	94.32% <ø> (ø)

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[djhoese]

Test failed due to an HTTP hiccup when sending coverage information to coveralls. I've restarted them.

[coveralls]

Coverage remained the same at 93.851% when pulling 20d1b4ae8edb17424d72b6090049a0f43eba85ba on bzah:fix/pyproj_min_version into 35782d049fa0a435a7e9fa6744c051404886f17f on pytroll:main.

[djhoese]

Thanks for the fix!