6.8.0

Enhancements:

• Upgrade React Native 0.62.2 #6323 by jinshin1013

Bug fixes:

• Parse icon only if it is defined #6333 by guyca
• Fix crash when currentTabIndex is defined #6334 by guyca
• Fix bottomTabs long press event #6327 by yogevbd
• Fix SearchBar false render #6317 by jinshin1013
• Fix registerBottomTabSelectedListener unselected value #6326 by yogevbd
• Fix bottomTabs visibility when there is no stack #6324 by yogevbd