Delete unnecessary dependency

Author: MichaelDeBoey

package.json

@@ -27,7 +27,6 @@
   },
   "homepage": "https://github.com/akiran/react-highlight",
   "dependencies": {
-    "create-react-class": "^15.5.2",
     "highlight.js": "^9.11.0",
     "react": "^15.5.4",
     "react-dom": "^15.5.4"