[gimp] .gitlab: make double space for separate lines.

[Jehan <jehanp src gnome org>]

commit 23ea45775195458a176a8fd0f8df9ee508c1d81f
Author: Jehan <jehan girinstud io>
Date:   Thu May 31 23:22:14 2018 +0200

    .gitlab: make double space for separate lines.
    
    Otherwise markdown just puts everything on the same line, which makes
    horrible formatting.

 .gitlab/issue_templates/bug.md | 4 ++++
 1 file changed, 4 insertions(+)
---
diff --git a/.gitlab/issue_templates/bug.md b/.gitlab/issue_templates/bug.md
index 6eab82512b..b939a0c1a9 100644
--- a/.gitlab/issue_templates/bug.md
+++ b/.gitlab/issue_templates/bug.md
@@ -1,5 +1,7 @@
 GIMP version:
+
 Operating System:
+
 Package: [flatpak? Installer from gimp.org? If another installer, tell us where from]
 
 # Description of the bug
@@ -16,9 +18,11 @@ Reproduction steps:
 1.
 2.
 3.
+
 …
 
 Expected result:
+
 Actual result:
 
 # Additional information