Add relevant links to README.md

README.md

@@ -8,12 +8,15 @@ Project Home Page:
 ### Notes
 
 1. If you are using node-xmpp-bosh v0.2.2 or earlier, please
-immediately update to v0.2.3 since it fixes the Billion Laughs (XML
-Entity Expansion) vulnerability.
+immediately update to v0.2.3 since it fixes the [Billion
+Laughs](https://en.wikipedia.org/wiki/Billion_laughs) (XML Entity
+Expansion) vulnerability.
 
 2. Some of the configuration variable names will change in
 v0.3.0. Please update your configuration files to reflect these
-changes. See issue #15 for more details.
+changes. See [issue
+#15](http://code.google.com/p/node-xmpp-bosh/issues/detail?id=15) for
+more details.
 
 3. The public-API has changed since the 0.4.x series. Please update
 your code if you are embedding node-xmpp-bosh.