v1.0

• SUPPORT ipywidgets 7.0 and drop ipywidgets 5.2
• UPGRADE: NGL v1.0.0-beta.4
• SUPPORT: Jupyterlab v0.27
• ADD: show_biopython
• ADD: show_iotbx
• ADD: show_rosetta
• ADD: show_file
• ADD: add_slice
• ADD: add_buffer
• ADD: add_label
• ADD: movie making
• ADD: set_coordinates for ComponentViewer
• FIX: nglview install always overwrite
• SUPPORT: widget serialization and sphinx-jupyter
• ADD: write_html