Update README.md

Author: jonasjabari

README.md

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 # matestack-ui-core | UI in pure Ruby
 
+----
 **Version 2.0.0 will be released on the 12th of April and proudly presented at RailsConf. Click here for a sneak peek: https://docs.matestack.io/v/2.0.0/**
 
+Most important changes in 2.0.0:
+* Change to MIT License
+* 5 to 12 times better rendering performance (depending on the context)
+* Removed Trailblazer dependency
+* Improved core code readability/maintainability
+----
+
 Boost your productivity & easily create component based web UIs in pure Ruby.
 Reactivity included if desired.