Newer pyqtgraph releases (>0.13.0) no longer supports GraphicsWindow

[ryosukecooltanaka]

StreamingPositionPlot() in fishplots.py uses the GraphicsWindow attribute in pyqtgraph, which apparently no longer exists in the latest release (>0.13.0) (stytra protocols wouldn't run due to the AttributeError).
Installing stytra with pip currently automatically installs the latest version of pyqtgraph.
Downgrading pyqtgraph 0.12.4 fixed the issue.

[DaniParr]

Editing fishplots.py from "class StreamingPositionPlot(pg.GraphicsWindow):" to "class StreamingPosition(pg.GraphicsView):" in line 16 and that solved that issue.
However, when I run it again another issue arises with utilities.py.
I then changed "if isinstance(v, collections.Mapping):" to "if isinstance(v, collections.ChainMap):" in line 242
and then running "python -m stytra.examples.looming_exp" worked fine for me! :)

[nvbln]

I will close this as it has been fixed by PR #93.