Release 8.0.2

What's Changed

• Update to lerna 5.4.3 by @jtpio in #3548
• Deserialize state before setting it, as is done elsewhere set_state is used by @jasongrout in #3549
• Make the selection widgets mapping options error more helpful. by @jasongrout in #3556
• Allow the 'class' attribute to pass the sanitizer by @jasongrout in #3565
• Tweak some typings by @vidartf in #3554
• Fix slider update on readout text change by @jtpio in #3568
• Allow Mappings to be given as the options in a selection widget again. by @jasongrout in #3557
• Make the widget renderer higher priority in JupyterLab by @jasongrout in #3579
• Datetime widget fixes by @vidartf in #3581
• Narrow deserialize and improve strictness by @vidartf in #3571
• Add a note about defining widget model defaults with es6 inheritance. by @jasongrout in #3582
• Remove migration note about selection widgets and dictionaries by @jasongrout in #3583

Full Changelog: 8.0.1...8.0.2