Update README.md

Author: kazemicode

README.md

@@ -23,5 +23,5 @@
 - [x] [Assignment 9](/assignment9): jQuery Selectors, Commands, Events/Effects, and UI
 - [x] [Assignment 10](/assignment10): jQuery Traversals, AJAX calls, and Plugins
 - [x] [Assignment 11](/assignment11): Bootstrap
-- [ ] [Assignment 12](/assignment12): React
-- [ ] [Assignment 13](/assignment13): Node.js
+- [x] [Assignment 12](/assignment12): React
+- [x] [Assignment 13](/assignment13): Node.js