Add FOSDEM 2018
# Please enter the commit message for your changes. Lines starting
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# On branch master
# Your branch is up-to-date with 'origin/master'.
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# Changes to be committed:
#	new file:   conferences/fosdem2018/banner.png
#	new file:   conferences/fosdem2018/fosdem2018.cfg
#	modified:   debian/changelog
#	modified:   icons/fosdem-banner.xcf
#	modified:   setup.py
#	modified:   sojourner.cfg
#	modified:   sojourner/__init__.py
#
