* doc/misc/erc.texi: Change ERCVER to 5.6.0.30.1.
* lisp/erc/erc.el: Change Version package header to 5.6.0.30.1. Don't
bother updating the `customize-package-emacs-version-alist' entry
because no user options are yet affected.
(erc-version): Change version to 5.6.0.30.1.
Do not merge to master.