Limit talk types in submissions for 2nd CFP.
Limit talk types in submissions for 2nd CFP.

artcz/epcon,malemburg/epcon,barrachri/epcon,artcz/epcon,EuroPython/epcon,EuroPython/epcon,matrixise/epcon,malemburg/epcon,PythonSanSebastian/epcon,PythonSanSebastian/epcon,PythonSanSebastian/epcon,malemburg/epcon,PythonSanSebastian/epcon,PythonSanSebastian/epcon,PythonSanSebastian/epcon,malemburg/epcon,artcz/epcon,barrachri/epcon,matrixise/epcon,matrixise/epcon,artcz/epcon,barrachri/epcon,artcz/epcon,barrachri/epcon,artcz/epcon,barrachri/epcon,malemburg/epcon,barrachri/epcon,malemburg/epcon,matrixise/epcon,matrixise/epcon,matrixise/epcon,EuroPython/epcon,EuroPython/epcon