Store bot in PreCheckoutQuery.

[nmlorg]

Fixes #937

[codecov]

Codecov Report

Merging #953 into master will decrease coverage by 0.12%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #953      +/-   ##
==========================================
- Coverage    91.8%   91.68%   -0.13%     
==========================================
  Files         103      103              
  Lines        4040     4040              
  Branches      638      638              
==========================================
- Hits         3709     3704       -5     
- Misses        193      197       +4     
- Partials      138      139       +1

Impacted Files	Coverage Δ
telegram/payment/precheckoutquery.py	100% <100%> (ø)	⬆️
telegram/utils/request.py	66.96% <0%> (-0.9%)	⬇️
telegram/bot.py	87.51% <0%> (-0.5%)	⬇️

[jsmnbom]

LGTM thanks for fixing this.
Go ahead and add yourself to the Authors.rst list if you'd like ^^

[nmlorg]

Done
:)

[tsnoam]

@nmlorg thank you for your contribution.