package.json: Edits for VSCode

Author: 1st1

package.json

@@ -16,6 +16,8 @@
   "description": "Syntax highlighter for cutting edge Python.",
   "license": "MIT",
   "publisher": "magicstack",
+  "categories": ["Languages"],
+  "keywords": ["python", "highlighter", "syntax", "python3"],
   "contributes": {
     "//": "This section is for VSCode",
     "languages": [