This update for discount to version 2.2.4 fixes the following issues:

Security issues fixed:

- CVE-2018-11468: Fixed a heap-based buffer over-read in the __mkd_trim_line function from mkdio.c (boo#1094809)
- CVE-2018-12495: Fixed a heap-based buffer over-read via a crafted file (boo#1098252)