Update README.md

Remove not needed reference to Qwt.

README.md

@@ -85,7 +85,6 @@ Check my other project `Volbx` for real world CMake integration.
 | CMake | 3.30.2 | 3.30.2 |3.28.3 |
 | Git | 2.46.0 | 2.46.0 | 2.43.0 |
 | Qt | 6.5.2 | 6.5.2 | 6.5.2 |
-| Qwt | 6.3.1 | 6.3.1 | 6.3.1 |
 
 ## Usage
 The easiest way is to check examples subproject, where you can find how to create and interact with each widget included in this library. Alternatively, tests subproject can be checked. Usage also can be found in my other project called `Volbx` where widgets from this library are used.