Performance improvements by avoiding child views are measured more than twice #46
The version 2.0.0 improves the performance significantly especially FlexboxLayout is deeply nested.
As described in #514, there were unnecessary measure calls even if any Flexitems in a FlexLine didn't have any flexGrow or flexShrink attributes set.
Similarly, the default values for alignItems and alignContent for FlexboxLayout has changed from stretch to flex_start starting from 2.0.0 because setting stretch for alignItems turned out to be expensive. Setting the default value as stretch might increase the unnecessary measure calls.
This is a major version release because the change may break the existing apps.