pass example to request schema.

[Niccolum]

No description provided.

[codecov-io]

Codecov Report

Merging #90 into master will increase coverage by 0.22%.
The diff coverage is 95.83%.

@@            Coverage Diff             @@
##           master      #90      +/-   ##
==========================================
+ Coverage   92.38%   92.60%   +0.22%     
==========================================
  Files           8        8              
  Lines         210      230      +20     
==========================================
+ Hits          194      213      +19     
- Misses         16       17       +1     

Impacted Files	Coverage Δ
aiohttp_apispec/aiohttp_apispec.py	88.61% <93.75%> (+0.76%)	⬆️
aiohttp_apispec/decorators/request.py	100.00% <100.00%> (ø)

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[maximdanilchenko]

@Niccolum sorry for the delay! Thank you for your help!