Document the manual console

Author: RobinDaugherty

README.md

@@ -15,8 +15,10 @@ It is also usable outside of Rails in any Rack app as Rack middleware.
 
 * Full stack trace
 * Source code inspection for all stack frames (with highlighting)
+* Link to the specific file and line while inspecting
 * Local and instance variable inspection
 * Live REPL on every stack frame
+* For XHR requests, a text response that provides the error, with full features available by visiting `/__better_errors` to inspect the most recent exception.
 
 ## Installation