Add support for stub files.

[hadialqattan]

Fixes: #149

[codeclimate]

Code Climate has analyzed commit e5084f6 and detected 1 issue on this pull request.

Here's the issue category breakdown:

Category	Count
Complexity	1

View more on Code Climate.

[codecov]

Codecov Report

Merging #150 (e5084f6) into master (542147d) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #150   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           28        28           
  Lines         2787      2822   +35     
=========================================
+ Hits          2787      2822   +35     

Impacted Files	Coverage Δ
pycln/utils/pathu.py	100.00% <ø> (ø)
tests/test_pathu.py	100.00% <ø> (ø)
pycln/utils/refactor.py	100.00% <100.00%> (ø)
pycln/utils/regexu.py	100.00% <100.00%> (ø)
tests/test_refactor.py	100.00% <100.00%> (ø)
tests/test_regexu.py	100.00% <100.00%> (ø)