Update safe_msi for new pyproj compatibility

[mraspaud]

• Tests passed
• Passes flake8 satpy

[coveralls]

Coverage decreased (-0.02%) to 90.02% when pulling 5d6bc92 on mraspaud:fix-safe-msi into 3128bf5 on pytroll:master.

[mraspaud]

I know this isn't tested, but tests are coming in a later PR (including switch from glymur to rasterio possibly)

[codecov]

Codecov Report

Merging #1259 into master will decrease coverage by 0.01%.
The diff coverage is 12.50%.

@@            Coverage Diff             @@
##           master    #1259      +/-   ##
==========================================
- Coverage   90.03%   90.01%   -0.02%     
==========================================
  Files         218      218              
  Lines       31275    31282       +7     
==========================================
+ Hits        28159    28160       +1     
- Misses       3116     3122       +6     

Impacted Files	Coverage Δ
satpy/readers/msi_safe.py	2.29% <12.50%> (-0.13%)	⬇️
satpy/scene.py	90.22% <0.00%> (+0.17%)	⬆️

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[mraspaud]

@djhoese any comments?

[djhoese]

Do we have a hard requirement on pyproj 2.0+? If so then LGTM.

[mraspaud]

Do we have a hard requirement on pyproj 2.0+? If so then LGTM.

We don't, so I have to fix this.