update install.md with atom jshint packages

Author: mnquintana

pages/install.md

@@ -43,6 +43,10 @@ for ST2.
 * [Sublime Linter](https://github.com/Kronuz/SublimeLinter), inline lint
 highlighting for ST2.
 
+#### Atom
+* [linter-jshint](https://github.com/AtomLinter/linter-jshint), JSHint plugin for Atom's Linter
+* [JSHint for Atom](https://github.com/sindresorhus/atom-jshint), JSHint package for Atom
+
 #### TextMate
 
 * [JSHint Bundle for TextMate 2](https://github.com/bodnaristvan/JSHint.tmbundle)