Add a comment specifying the fixed license error in a file

OBS-URL: https://build.opensuse.org/package/show/KDE:Applications/kolourpaint?expand=0&rev=57

kolourpaint.spec

@@ -25,6 +25,8 @@ Release:        0
 %{!?_kapp_version: %global _kapp_version %(echo %{version}| awk -F. '{print $1"."$2}')}
 # See bnc#717722 for license details
 Summary:        Paint Program
+# kolourpaint-17.04.1/imagelib/effects/blitz.h is GPL licensed by mistake in the tarball
+# but was relicensed to BSD in commit 36f297a9c9c9f5323273bdc57f5ee3a4e8e00743 (part of the next release)
 License:        BSD-2-Clause and LGPL-2.1+ and GFDL-1.2+
 Group:          Productivity/Graphics/Bitmap Editors
 Url:            http://www.kde.org