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[asvetlov]

Add type annotations, drop python 3.4

[codecov]

Codecov Report

Merging #37 into master will increase coverage by 27.36%.
The diff coverage is 91.66%.

@@             Coverage Diff             @@
##           master      #37       +/-   ##
===========================================
+ Coverage   66.66%   94.02%   +27.36%     
===========================================
  Files           1        1               
  Lines          60       67        +7     
  Branches       10       11        +1     
===========================================
+ Hits           40       63       +23     
+ Misses         18        2       -16     
  Partials        2        2

Impacted Files	Coverage Δ
async_timeout/__init__.py	94.02% <91.66%> (+27.36%)	⬆️

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