Release process

Update package version

File	Entry	Content
`ipywidgets_bokeh/__init__.py`	`__version__`	`1.0.0dev2`
`ipywidgets_bokeh/kernel.py`	`implementation_version`	`1.0.0dev2`
`ipywidgets_bokeh/package.json`	`version`	`1.0.0-dev.2`
`setup.py`	`version`	`1.0.0dev2`