remove Bot._message_wrapper

[Eldinnie]

Moved tho code to the @message decorator instead

Fixes #752

[codecov]

Codecov Report

Merging #822 into master will decrease coverage by 1.2%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #822      +/-   ##
==========================================
- Coverage   91.89%   90.69%   -1.21%     
==========================================
  Files         101      101              
  Lines        3987     3985       -2     
  Branches      603      577      -26     
==========================================
- Hits         3664     3614      -50     
- Misses        187      218      +31     
- Partials      136      153      +17

Flag	Coverage Δ
#Appveyor	?
#Travis	90.69% <100%> (-0.84%)	⬇️

Impacted Files	Coverage Δ
telegram/bot.py	87.43% <100%> (-0.58%)	⬇️
telegram/files/inputfile.py	79.72% <0%> (-10.82%)	⬇️
telegram/base.py	89.74% <0%> (-10.26%)	⬇️
telegram/utils/helpers.py	70% <0%> (-10%)	⬇️
telegram/games/game.py	94.28% <0%> (-5.72%)	⬇️
telegram/ext/messagequeue.py	65.06% <0%> (-4.82%)	⬇️
telegram/utils/webhookhandler.py	92.77% <0%> (-4.82%)	⬇️
telegram/message.py	91.23% <0%> (-4.79%)	⬇️
telegram/utils/request.py	64.28% <0%> (-2.68%)	⬇️
telegram/ext/conversationhandler.py	79.27% <0%> (-1.81%)	⬇️
... and 3 more

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[jsmnbom]

I can't believe we didn't do this sooner xD