Eliminate deprecated format_ keyword from read and write methods

[matteobachetti]

No description provided.

[codecov]

Codecov Report

Merging #729 (eb6a478) into main (9b269d9) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #729      +/-   ##
==========================================
- Coverage   97.16%   97.15%   -0.01%     
==========================================
  Files          42       42              
  Lines        7872     7852      -20     
==========================================
- Hits         7649     7629      -20     
  Misses        223      223              

Impacted Files	Coverage Δ
stingray/base.py	96.90% <100.00%> (-0.09%)	⬇️
stingray/events.py	100.00% <100.00%> (ø)
stingray/lightcurve.py	97.82% <100.00%> (-0.02%)	⬇️
stingray/simulator/simulator.py	100.00% <100.00%> (ø)
stingray/simulator/transfer.py	98.90% <100.00%> (-0.05%)	⬇️

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[dhuppenkothen]

👍 LGTM! We should make a note somewhere when we release a new version (in the version notes?) that this is a breaking change?

[matteobachetti]

@dhuppenkothen this name change should be sufficient. Towncrier will take care of it.