Vaadin Framework 8.6.3

Vaadin Framework 8.6.3 is a maintenance release with the following fixes :

• Fix item missing issue when opening ComboBox popup
• Fix states updating issue with frozen Grid column
• OSGi: Fixing dynamic resource registration after activation (Thanks @swimmesberger for the contribution)
• A couple of javadoc improvements
  See the complete list of changes since 8.6.3

Known Limitation

Vaadin Framework 8.6.3 has been tested with Chrome 69, but not the Chrome 70 because of the malfunctioning with TestBench APIs after Chrome update. We are going to fix it as soon as possible.