Add to Keymaps category

package.json

@@ -2,13 +2,14 @@
     "name": "sublime-keybindings",
     "displayName": "Sublime Text Keymap",
     "description": "Popular Sublime Text keybindings for VS Code.",
-    "version": "1.5.5",
+    "version": "1.5.6",
     "publisher": "ms-vscode",
     "engines": {
         "vscode": "^1.6.0"
     },
     "categories": [
-        "Other"
+        "Other",
+        "Keymaps"
     ],
     "keywords": [
         "keymap"