add missing less references (#15)

this specifically addresses issue #14 with the addition of `onLanguage:less`.

.vscodeignore

@@ -4,5 +4,6 @@
 *.css
 *.png
 *.scss
+*.less
 media/*.ai
 test

README.md

@@ -3,7 +3,7 @@
 [![Dependency Status](https://david-dm.org/shinnn/vscode-stylelint.svg)](https://david-dm.org/shinnn/vscode-stylelint)
 [![devDependency Status](https://david-dm.org/shinnn/vscode-stylelint/dev-status.svg)](https://david-dm.org/shinnn/vscode-stylelint#info=devDependencies)
 
-A [Visual Studio Code](https://code.visualstudio.com/) extension to lint [CSS](https://www.w3.org/Style/CSS/)/[SCSS](http://sass-lang.com/documentation/file.SASS_REFERENCE.html#syntax) with [stylelint](http://stylelint.io/)
+A [Visual Studio Code](https://code.visualstudio.com/) extension to lint [CSS](https://www.w3.org/Style/CSS/)/[SCSS](http://sass-lang.com/documentation/file.SASS_REFERENCE.html#syntax)/[Less](http://lesscss.org/) with [stylelint](http://stylelint.io/)
 
 ![screenshot](screenshot.png)
 
@@ -33,7 +33,7 @@ Enable the linter in the VS Code [settings](https://code.visualstudio.com/docs/c
 Type: `Boolean`  
 Default: `true`
 
-Control whether [stylelint](https://github.com/stylelint/stylelint/) is enabled for CSS/SCSS files or not.
+Control whether [stylelint](https://github.com/stylelint/stylelint/) is enabled for CSS/SCSS/Less files or not.
 
 #### stylelint.configOverrides
 

package.json

@@ -2,7 +2,7 @@
   "name": "stylelint",
   "version": "0.8.3",
   "displayName": "stylelint",
-  "description": "Modern CSS/SCSS linter",
+  "description": "Modern CSS/SCSS/Less linter",
   "publisher": "shinnn",
   "repository": "https://github.com/shinnn/vscode-stylelint",
   "homepage": "https://github.com/shinnn/vscode-stylelint#readme",
@@ -21,7 +21,8 @@
   ],
   "activationEvents": [
     "onLanguage:css",
-    "onLanguage:sass"
+    "onLanguage:sass",
+    "onLanguage:less"
   ],
   "main": "extension.js",
   "contributes": {
@@ -32,7 +33,7 @@
         "stylelint.enable": {
           "type": "boolean",
           "default": true,
-          "description": "Control whether stylelint is enabled for CSS/SCSS files or not."
+          "description": "Control whether stylelint is enabled for CSS/SCSS/Less files or not."
         },
         "stylelint.config": {
           "type": "object",