update description

[chrisblossom]

Since this plugin isn't used only for before building anymore, I'd recommend updating the Github description as well. A webpack plugin to remove/clean your build folder(s)

[codecov-io]

Codecov Report

Merging #100 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #100   +/-   ##
=======================================
  Coverage   98.64%   98.64%           
=======================================
  Files           1        1           
  Lines          74       74           
  Branches       25       25           
=======================================
  Hits           73       73           
  Misses          1        1

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