[gimp] devel-docs: add the package maintainers in the release-howto.

[Jehan <jehanp src gnome org>]

commit dc9a30446ba9a27f10cc37c7627dfd11f6ac9c88
Author: Jehan <jehan girinstud io>
Date:   Sat Sep 15 09:20:17 2018 +0200

    devel-docs: add the package maintainers in the release-howto.
    
    Nicknames on IRC/gitlab are hard, even more when they change depending
    on the media! I realize we are regularly asking them or unsure of who to
    contact (for instance here for releases). Let's associate each package
    with its current maintainer to make it easy to contact the right person
    to prepare our official packages before a release.

 devel-docs/release-howto.txt | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)
---
diff --git a/devel-docs/release-howto.txt b/devel-docs/release-howto.txt
index eaf4234856..787e66c2b5 100644
--- a/devel-docs/release-howto.txt
+++ b/devel-docs/release-howto.txt
@@ -17,9 +17,10 @@
      on, and how many changes to expect. An example message is:
      https://mail.gnome.org/archives/gnome-i18n/2016-October/msg00035.html
 
- ( ) Also notify the maintainers of the official builds for Windows,
-     macOS and flatpak of the upcoming release so they have some time to
-     sort out issues with their builds.
+ ( ) Also notify the maintainers of the official builds for Windows
+     (irc:ender/@jernejs), macOS (irc:Samm/@samm-git) and flatpak
+     (irc:Jehan/@Jehan) of the upcoming release so they have some time
+     to sort out issues with their builds.
 
  ( ) Make sure we have a <release> tag inside
      desktop/org.gimp.GIMP.appdata.xml.in.in for this upcoming