Fix issue #969: Add support for single line exclusions

[timothycrosley]

Fixes #969

[codecov-io]

Codecov Report

Merging #1085 into develop will increase coverage by 0.02%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           develop   #1085      +/-   ##
==========================================
+ Coverage    84.87%   84.9%   +0.02%     
==========================================
  Files           41      41              
  Lines         3617    3623       +6     
  Branches       654     654              
==========================================
+ Hits          3070    3076       +6     
  Misses         412     412              
  Partials       135     135

Impacted Files	Coverage Δ
isort/profiles.py	100% <100%> (ø)	⬆️
isort/output.py	96.77% <100%> (ø)	⬆️
tests/test_isort.py	99.23% <100%> (ø)	⬆️
isort/main.py	64.31% <100%> (+0.14%)	⬆️
isort/settings.py	82.29% <100%> (+0.05%)	⬆️

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