Update README.md

Author: egil

README.md

@@ -2,8 +2,6 @@
 Prototype testing library that renders Razor Components as HTML and compare the result to an 
 expected result, using the [XMLDiff](https://www.xmlunit.org/) library and [Shouldly](https://github.com/shouldly/shouldly) for writing out error messages.
 
-**NOTE: Only tested with Preview-6**
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 ## Examples
 The following examples uses XUnit and Shouldly for testing.