add __version__ to __init__.py
add __version__ to __init__.py

freeman-lab/altair,jakevdp/altair,ellisonbg/altair,tacaswell/altair,alope107/altair,wrobstory/altair,freeman-lab/altair,tacaswell/altair,kootenpv/altair,wrobstory/altair,alope107/altair,altair-viz/altair,kootenpv/altair