Canvas has no property show()

[emilmirzayev]

Hey there! thanks for the good work!

Class matplotlib.backends.backend_tkagg.FigureCanvasTkAgg has no longer show() metod. It is now draw()

Changing the occurrences seems to solve the problem!

[jpatokal]

NavigationToolbar2TkAgg also no longer exists in matplotlib 3.0.0+: https://matplotlib.org/api/api_changes.html

Pull request incoming to fix both these issues.