fix markdown multi line code
fix markdown multi line code

Multi line code blocks are now displayed correctly.

Fixes #875

Signed-off-by: Thomas Hipp <ba262c2d62f6fd76f236e5802148840e86e9b719@suse.com>

angry-tony/Portus-20170827,krishnak9/Portus,angry-tony/Portus-20170827,jloehel/Portus,mssola/Portus,SUSE/Portus,SUSE/Portus,krishnak9/Portus,mssola/Portus,krishnak9/Portus,SUSE/Portus,krishnak9/Portus,mssola/Portus,SUSE/Portus,mssola/Portus,jloehel/Portus,angry-tony/Portus-20170827,jloehel/Portus,angry-tony/Portus-20170827