Fix broken logo link

logo64.png was deleted, replaced by wxUiEditor.svg

README.md

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-# ![logo](src/art_src/logo64.png) wxUiEditor
+# ![logo](src/art_src/wxUiEditor.svg) wxUiEditor
 
 This WYSIWYG tool is used to create and maintain [wxWidgets](https://docs.wxwidgets.org/trunk/index.html) UI elements (dialogs, menus, etc.), generating either C++, [wxPython](https://wxpython.org/), [wxRuby3](https://github.com/mcorino/wxRuby3) or XRC code. It supports almost all of the wxWidgets UI controls along with bitmap bundles and SVG files.