Add screenshots to doc string

Author: migerh

README.md

@@ -17,7 +17,7 @@ Without `console_error_panic_hook` you just get something like *RuntimeError: Un
 
 ![Console without panic hook](without_panic_hook.png)
 
-but with this panic hook installed you will see the panic message
+With this panic hook installed you will see the panic message
 
 ![Console with panic hook set up](with_panic_hook.png)
 

src/lib.rs

@@ -13,6 +13,14 @@
 //! will typically capture a stack trace and display it with the logged error
 //! message.
 //!
+//! Without `console_error_panic_hook` you just get something like *RuntimeError: Unreachable executed*
+//!
+//! ![Console without panic hook](without_panic_hook.png)
+//!
+//! With this panic hook installed you will see the panic message
+//!
+//! ![Console with panic hook set up](with_panic_hook.png)
+//!
 //! ## Usage
 //!
 //! There are two ways to install this panic hook.