Fix issue template using old check_satpy import

[djhoese]

Closes #1572

[codecov]

Codecov Report

Merging #1575 (4521f2b) into master (2969c14) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1575   +/-   ##
=======================================
  Coverage   92.54%   92.54%           
=======================================
  Files         251      251           
  Lines       36770    36770           
=======================================
  Hits        34027    34027           
  Misses       2743     2743           

Flag	Coverage Δ
behaviourtests	4.50% <ø> (ø)
unittests	92.68% <ø> (ø)

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