document tdating

[feldmann-m]

update documentation tdating

[codecov]

Codecov Report

Merging #245 (1ffb12a) into master (96a0ddc) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #245      +/-   ##
==========================================
- Coverage   80.78%   80.77%   -0.01%     
==========================================
  Files         140      140              
  Lines       10625    10625              
==========================================
- Hits         8583     8582       -1     
- Misses       2042     2043       +1     

Flag	Coverage Δ
unit_tests	80.77% <ø> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pysteps/io/importers.py	71.73% <0.00%> (-0.15%)	⬇️

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[dnerini]

All good for me, thanks for the contribution, very much appreciated!