bump version for beta 2
bump version for beta 2

euroscipy/symposion,pyohio/symposion,miurahr/symposion,faulteh/symposion,toulibre/symposion,pyconau2017/symposion,TheOpenBastion/symposion,mbrochh/symposion,faulteh/symposion,pyconau2017/symposion,pinax/symposion,pyohio/symposion,toulibre/symposion,pydata/symposion,TheOpenBastion/symposion,mbrochh/symposion,pydata/symposion,euroscipy/symposion,miurahr/symposion,pinax/symposion