Log Message:
inspircd: Update to 2.0.28

This release fixes a crash bug in the mysql module as well as fixing
several minor issues:

* Fixed BanCache entries existing after X-line expiry.
* Replaced all references to the dead InspIRCd wiki with the new InspIRCd
  docs site.
* Updated all documentation links to use https.
* Updated the Module Manager source list for the new inspircd-contrib
  repository.

InspIRCd v2 is now deprecated and will no longer receive security updates
after 2020-06-01.