Fix indentation for toc (#525)

Author: gauravtiwari

README.md

@@ -64,11 +64,11 @@ in which case you may not even need the asset pipeline. This is mostly relevant
   - [Heroku](#heroku)
 - [Testing](#testing)
 - [Troubleshooting](#troubleshooting)
-      - [ENOENT: no such file or directory - node-sass](#enoent-no-such-file-or-directory---node-sass)
-      - [Can't find hello_react.js in manifest.json](#cant-find-hello_reactjs-in-manifestjson)
-      - [Error: listen EADDRINUSE 0.0.0.0:8080](#error-listen-eaddrinuse-00008080)
-      - [throw er; // Unhandled 'error' event](#throw-er--unhandled-error-event)
-      - [webpack or webpack-dev-server not found](#webpack-or-webpack-dev-server-not-found)
+    - [ENOENT: no such file or directory - node-sass](#enoent-no-such-file-or-directory---node-sass)
+    - [Can't find hello_react.js in manifest.json](#cant-find-hello_reactjs-in-manifestjson)
+    - [Error: listen EADDRINUSE 0.0.0.0:8080](#error-listen-eaddrinuse-00008080)
+    - [throw er; // Unhandled 'error' event](#throw-er--unhandled-error-event)
+    - [webpack or webpack-dev-server not found](#webpack-or-webpack-dev-server-not-found)
 - [Wishlist](#wishlist)
 - [License](#license)