Fixed typo in minFolder description

changed "varible thet contains" to "variable that contains" in minFolder description
Merge pull request #14 from pierrelegagneur/patch-1

chore(help) typo in minFolder description
feature(package) uglify: 2.4.x -> 2.4.7
feature(minify) v0.2.4
Merge pull request #15 from coderaiser/dev

Minify v0.2.4