tools/hg/install: seems like hg is up to v3.2

Author: tantek

tools/hg/install.txt

@@ -152,7 +152,7 @@ hg --version
 You should see something like:
 
 <code>
-Mercurial Distributed SCM (version 2.2.1)
+Mercurial Distributed SCM (version 3.2)
 (see http://mercurial.selenic.com for more information)
 </code>