pyqtgraph 0.13 compatability

[darksidelemm]

When using PyQt5 5.15 and pyqtgraph 0.13.1 we get the error:

$ python3 horus-gui.py 
Traceback (most recent call last):
  File "/home/mwheeler/horus-gui/horus-gui.py", line 5, in <module>
    from horusgui.gui import *
  File "/home/mwheeler/horus-gui/horusgui/gui.py", line 28, in <module>
    from .widgets import *
  File "/home/mwheeler/horus-gui/horusgui/widgets.py", line 5, in <module>
    class QHLine(QtGui.QFrame):
AttributeError: module 'pyqtgraph.Qt.QtGui' has no attribute 'QFrame'

Need to check whats going on here.

[dalewegner]

Got similar error.

[darksidelemm]

I think we're good with this now..