[gimp] desktop: use tilde for 'rc' separation in version scheme.

[Jehan Pagès <jehanp src gnome org>]

commit 6057828582b924640f5d9c14dcd410c85faf4d10
Author: Jehan <jehan girinstud io>
Date:   Thu Apr 26 13:16:20 2018 +0200

    desktop: use tilde for 'rc' separation in version scheme.
    
    In other words, number the release candidates: 2.10.0~rc*.
    In any case, this makes `rpmdev-vercmp` to consider them before 2.10.0,
    unlike using a hyphen separator.
    
    Though I still leave the <releases> trick from commit fb6328b9ad so that
    our unit test succeeds, since `appstream-util` still considers the other
    order.

 desktop/org.gimp.GIMP.appdata.xml.in.in |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/desktop/org.gimp.GIMP.appdata.xml.in.in b/desktop/org.gimp.GIMP.appdata.xml.in.in
index f35d8ad..3799247 100644
--- a/desktop/org.gimp.GIMP.appdata.xml.in.in
+++ b/desktop/org.gimp.GIMP.appdata.xml.in.in
@@ -127,7 +127,7 @@
   </releases>
 
   <releases>
-    <release version="2.10.0-rc2" date="2018-04-17" type="development">
+    <release version="2.10.0~rc2" date="2018-04-17" type="development">
       <description>
         <_p>
         In this second release candidate before GIMP 2.10.0, while
@@ -154,7 +154,7 @@
         <_p>For more information, see https://www.gimp.org/news/2018/04/17/gimp-2-10-0-rc2-released/</_p>
       </description>
     </release>
-    <release version="2.10.0-rc1" date="2018-03-26" type="development">
+    <release version="2.10.0~rc1" date="2018-03-26" type="development">
       <description>
         <_p>
         GIMP 2.10.0-RC1 is the first release candidate before GIMP