Fix link in release notes.

Contributed-by: Gintautas Grigelionis
Pull request: #90

Author: jaikiran

asciidoc/release-notes.adoc

@@ -45,7 +45,7 @@ For details about the following changes, check our JIRA install at link:https://
 
 *List of changes since Ivy 2.5.0:*
 
-- BREAKING: Removed old fr\jayasoft\ivy\ant\antlib.xml AntLib definition file (jira:IVY-1612)
+- BREAKING: Removed old fr\jayasoft\ivy\ant\antlib.xml AntLib definition file (jira:IVY-1612[])
 - FIX:
 
 - IMPROVEMENT: