Update AUTHORS.rst

[pfilo8]

As allowed in this PR :)
#538

Checklist

Here are some things to check before creating the PR. If you encounter any issues, do let us know :)

• I have read the CONTRIBUTING file.
• My PR is targetted at the dev branch (and not towards the master branch).
• I ran the CODE CHECKS on the files I added or modified and fixed the errors.
• I have added the newly added features to News.rst (if applicable)

[codeclimate]

Code Climate has analyzed commit 451592b and detected 0 issues on this pull request.

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[codecov-commenter]

Codecov Report

Merging #539 (451592b) into master (c110438) will increase coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #539      +/-   ##
==========================================
+ Coverage   85.31%   85.33%   +0.02%     
==========================================
  Files         199      199              
  Lines        9750     9750              
==========================================
+ Hits         8318     8320       +2     
+ Misses       1432     1430       -2     

Impacted Files	Coverage Δ
neurokit2/ecg/ecg_findpeaks.py	93.75% <0.00%> (+0.17%)	⬆️
neurokit2/rsp/rsp_simulate.py	99.10% <0.00%> (+0.89%)	⬆️

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