minor updates (add new shortened IPs)

- signed-off-by: trimstray <trimstray@gmail.com>

README.md

@@ -1478,10 +1478,16 @@ IP addresses can be shortened by dropping the zeroes:
 http://1.0.0.1 → http://1.1
 http://127.0.0.1 → http://127.1
 http://192.168.0.1 → http://192.168.1
+
+http://0xC0A80001 or http://3232235521 → 192.168.0.1
+http://192.168.257 → 192.168.1.1
+http://192.168.516 → 192.168.2.4
 ```
 
   > This bypasses WAF filters for SSRF, open-redirect, etc where any IP as input gets blacklisted.
 
+For more information please see [How to Obscure Any URL](http://www.pc-help.org/obscure.htm) and [Magic IP Address Shortcuts](https://stuff-things.net/2014/09/25/magic-ip-address-shortcuts/).
+
 #### One-liners &nbsp;[<sup>[TOC]</sup>](#anger-table-of-contents)
 
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