Add myself to the MAINTAINERS (#82)

:blush:

MAINTAINERS

@@ -2,6 +2,7 @@ Andrey Nering <nobody@nobody.tld> (@andreynering)
 Kim Carlbäcker <kim.carlbacker@gmail.com> (@bkcsoft)
 LefsFlare <nobody@nobody.tld> (@LefsFlarey)
 Lunny Xiao <xiaolunwen@gmail.com> (@lunny)
+Matthias Loibl <mail@matthiasloibl.com> (@metalmatze)
 Rachid Zarouali <nobody@nobody.tld> (@xinity)
 Rémy Boulanouar <admin@dblk.org> (@DblK)
 Sandro Santilli <strk@kbt.io> (@strk)