Plot labels from examples unclear

[lichadezhang]

Some graphs generated from the example code have unclear labels, see the attached image for an example

[planes]

Hi!
This is an issue with the current version of matplotlib and SUAVE. Matplotlib, the package that SUAVE uses to plot figures, just changed their routines. You can see their writeup here.

The fix for this is simple. You can replace any line with this format
axes = fig.add_subplot(...

with
plt.subplot(....

If you have done a develop install, you should be able to just do a find and replace for the above in this file.

Another easy fix would be to change to matplotlib 3.3.4.

The next release of SUAVE will include these changes.