Updating LICENSE for cssesc NPM module

[mertdeg2]

LICENSE-MIT.txt creates conflicts with some tools, LICENSE seems to be more uniform throughout github.

Also, the license didn't match MIT license template in github, so i have update that little bit

[codecov-io]

Codecov Report

Merging #12 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master    #12   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           1      1           
  Lines          70     70           
  Branches       25     25           
=====================================
  Hits           70     70

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[mathiasbynens]

LICENSE-MIT.txt creates conflicts with some tools

Which tools?

Also, the license didn't match MIT license template in github, so i have update that little bit

GitHub seems to detect the current license just fine:

I’d rather not make such changes without understanding why.

[chriseppstein]

Naming the file LICENSE is the convention, but tools should really read the "license" field in package.json which uses a standard syntax to describe the licenses of projects. Tools should then falling back to examining LICENSE* to handle projects that don't correctly specify it in the package.json file.
https://github.com/mathiasbynens/cssesc/blob/master/package.json#L19