[[DOCS]] Correct project description
[[DOCS]] Correct project description

The terms of the JSON license [1] disqualify JSHint from the distinction
of "open source" software [2].

[1] https://www.gnu.org/licenses/license-list.html#JSON
[2] https://opensource.org/faq#evil

jshint/jshint,jshint/jshint,thomas658/jshint,thomas658/jshint