Added expected exported classes definitions

GraphWidget/GraphWidget.py

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+from matplotlib.backends.backend_qt5agg import FigureCanvasQTAgg
+
+class GraphWidget(FigureCanvasQTAgg):
+    def __init__(self, *args):
+        ...

GraphWidget/__init__.py

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+from .GraphWidget import GraphWidget
+
+__all__ = ("GraphWidget",)

PlotterDialog/PlotterDialog.py

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+from PyQt5.QtWidgets import QDialog
+
+class PlotterDIalog(QDialog):
+    def __init__(self):
+        super().__init__()
+
+        self.initUI()
+
+    def initUI(self):
+        ...

PlotterDialog/__init__.py

@@ -0,0 +1,3 @@
+from .PlotterDialog import PlotterDialog
+
+__all__ = ("PlotterDialog",)