Replaced 'Qt5' with 'PyQt5' in README.

I now realise the distinction I was subconsciously making. When referring to the Python packages, the correct name should be used (Tkinter, wxPython and PyQt5). The names of the classes and files, however, directly reference the GUI toolkits they are intended for.

Author: tfpf

README.md

@@ -13,7 +13,7 @@ pip install ScrollableContainers
 Scrollable containers are currently available for the following GUI toolkits.
 * [Tkinter](#Tkinter)
 * [wxPython](#wxPython)
-* [Qt5](#Qt5)
+* [PyQt5](#PyQt5)
 
 # Tkinter
 `ScrollableContainers.Tk.ScrollableFrameTk`: a comprehensive implementation of a scrollable frame, and the flagship
@@ -46,7 +46,7 @@ Add widgets to the `panel` attribute of a `ScrollablePanelWx` object.
 * Does everything the wrapped class does.
 * Horizontally centres the contents if the window is wider.
 
-# Qt5
+# PyQt5
 `ScrollableContainers.Qt5.ScrollableAreaQt5`: a thin wrapper around `PyQt5.QtWidgets.QScrollArea`.
 
 ### Usage