highlight rest and xml-rpc support

awesome-selfhosted had issues with my wording of the summary for their
site.  They wanted it to better match the official site.

Author: rouilj

website/www/index.txt

@@ -7,9 +7,9 @@ Roundup Issue Tracker
    <a href="https://pypi.org/project/roundup/">latest</a></div>
 
 Roundup is a simple-to-use and -install issue-tracking system with
-command-line, web and e-mail interfaces.  It is based on the winning
-design from Ka-Ping Yee in the Software Carpentry "Track" design
-competition.
+command-line, web, REST, XML-RPC and e-mail interfaces.  It is based
+on the winning design from Ka-Ping Yee in the Software Carpentry
+"Track" design competition.
 
 The current stable version of Roundup is 2.1.0. It is a bug fix
 and minor feature release for the major 2.0.0 release which