[NonGNU ELPA] Xml-Rpc version 1.6.15

[ELPA update]

Version 1.6.15 of package Xml-Rpc has just been released in NonGNU ELPA.
You can now find it in M-x package-list RET.

Xml-Rpc describes itself as:
  An elisp implementation of clientside XML-RPC

More at https://elpa.nongnu.org/nongnu/xml-rpc.html