wrong edgecolor and facecolor with pcolormesh

[zxdawn]

Description

The results of using edgecolor and facecolor with pcolormesh are different from the matplotlib.

Steps to reproduce

# your code here
import numpy as np
import prolpot as pplt

fig, axs = pplt.subplots()

z = np.arange(12).reshape((3, 4))

axs.pcolormesh(z, facecolor='none', edgecolors=None)

Expected behavior:

Actual behavior:

Equivalent steps in matplotlib

import matplotlib.pyplot as plt
import numpy as np

z = np.arange(12).reshape((3, 4))

plt.pcolormesh(z, facecolor='none', edgecolors=None)

Proplot version

3.5.1
0.9.5.post202