### Description I think it makes sense to use nonsticky bounds for some plots such as errorbar plot. Could you add an option for nonsticky bounds? ### Steps to reproduce In this example, the errorbars in the edges are hidden. ```python import numpy as np import pandas as pd import proplot as pplt state = np.random.RandomState(51423) data = state.rand(20, 8).cumsum(axis=0).cumsum(axis=1)[:, ::-1] data = data + 20 * state.normal(size=(20, 8)) + 30 data = pd.DataFrame(data, columns=np.arange(0, 16, 2)) fig, ax = pplt.subplots() h = ax.plot(data, means=True, label='label') ax.legend(h) ```  ### Proplot version 3.4.3 0.9.7
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