Revert "Entries: jQuery.validator.methods is available since 1.15.0"

This reverts commit 9f86ff2.

Author: staabm

pages/documentation.md

@@ -133,7 +133,7 @@ Some more methods are provided as add-ons, and are currently included in additio
 
 You can find the [source code for all additional methods in the GitHub repository](https://github.com/jzaefferer/jquery-validation/tree/master/src/additional).
 
-As of 1.15.0 it is possible to re-define the implementation of the built-in rules using the [`$.validator.methods` property](/jQuery.validator.methods/)
+It is possible to re-define the implementation of the built-in rules using the [`$.validator.methods` property](/jQuery.validator.methods/)
 
 # [General Guidelines](/reference)