fix bug where async def was not properly indented

[jkittner]

resolves #7

[codecov-commenter]

Codecov Report

Merging #12 (57b2330) into master (0eb5411) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master       #12   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            3         3           
  Lines          145       148    +3     
  Branches        20        21    +1     
=========================================
+ Hits           145       148    +3     

Impacted Files	Coverage Δ
tests/double_indent_test.py	100.00% <ø> (ø)
double_indent.py	100.00% <100.00%> (ø)

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