added Poznan event (#194)
added Poznan event (#194)

* added Poznan event

* Change file encoding to UTF-8

coderetreat/coderetreat.github.io,yugangbai/coderetreat.github.io,coderetreat/coderetreat.github.io,svenlange/coderetreat.github.io,yugangbai/coderetreat.github.io,svenlange/coderetreat.github.io,tpd-opitz/coderetreat.github.io,yugangbai/coderetreat.github.io,coderetreat/coderetreat.github.io,coderetreat/coderetreat.github.io,svenlange/coderetreat.github.io,tpd-opitz/coderetreat.github.io,yugangbai/coderetreat.github.io,tpd-opitz/coderetreat.github.io,svenlange/coderetreat.github.io