adding support for windows and linux

Author: tcarlsen

keymaps/htmlhint.json

@@ -1,5 +1,8 @@
 {
-    ".editor.html": {
+    ".platform-darwin .editor.html": {
         "cmd-alt-l": "htmlhint:hint"
+    },
+    ".platform-win32 .editor.html, .platform-linux .editor.html": {
+        "ctrl-alt-l": "htmlhint:lint"
     }
 }

readme.md

@@ -14,7 +14,7 @@ $ apm install htmlhint
 
 ## Usage
 
-HTMLHint is by default validating on save (this can be changed in the package settings), you can also execute it by hitting `cmd+alt+l` or run `Htmlhint` from the Command Palette.
+HTMLHint is by default validating on save (this can be changed in the package settings), you can also execute it by hitting `cmd+alt+l` on OS X or `ctrl-alt-l` on Windows and Linux.
 
 If you like you can even set it to validate while typing in the package settings.