Add hyperlinks to Jython bugs

--HG--
branch : distribute
extra : rebase_source : b3cfcd0da54b33c0571a678a1ea20b730e138f99

CHANGES.txt

@@ -9,7 +9,8 @@ CHANGES
 * Issue #303: Make sure the manifest only ever contains UTF-8 in Python 3.
 * Issue #329: Properly close files created by tests for compatibility with
   Jython.
-* Work around Jython bugs #1980 and #1981.
+* Work around Jython bugs `#1980 <http://bugs.jython.org/issue1980>`_ and
+  `#1981 <http://bugs.jython.org/issue1981`_.
 * Issue #334: Provide workaround for packages that reference `sys.__stdout__`
   such as numpy does. This change should address
   `virtualenv #359 <https://github.com/pypa/virtualenv/issues/359>`_ as long