REF: Update pyproj.Geod.npts to use geod_inverseline

[snowman2]

Noticed this note and figured it was safe to update:

# in proj 4.9.3 and later the next two steps can be replace by a call
# to geod_inverseline with del_s = line.s13/(npts+1)

[codecov]

Codecov Report

Merging #825 (1874a6d) into master (252eef9) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #825   +/-   ##
=======================================
  Coverage   95.16%   95.16%           
=======================================
  Files          21       21           
  Lines        1655     1655           
=======================================
  Hits         1575     1575           
  Misses         80       80           

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