update the square bracket link to an archived version as the original

is down.

Author: Cody Mikol

README.md

@@ -97,7 +97,7 @@ More information: http://www.bennadel.com/blog/2169-where-does-node-js-and-requi
 
 Detects `variable[key]` as a left- or right-hand assignment operand.
 
-More information: https://blog.liftsecurity.io/2015/01/14/the-dangers-of-square-bracket-notation/
+More information: https://web.archive.org/web/20150430062816/https://blog.liftsecurity.io/2015/01/15/the-dangers-of-square-bracket-notation
 
 #### `detect-possible-timing-attacks`