hg: openjfx/2.2.6/master: Update URL for repo in README file to 2.2.6

[kevin.rushforth at oracle.com]

Changeset: 4f06f91bdcf4
Author:    kcr
Date:      2012-12-08 16:27 -0800
URL:       http://hg.openjdk.java.net/openjfx/2.2.6/master/rev/4f06f91bdcf4

Update URL for repo in README file to 2.2.6

! README