seaborn version incompats.

[rafalcode]

Is your feature request related to a problem? Please describe

Seaborn v11.2 has totally dropped the JointGrid.annotate() method after previous version threw warnings saying it would be deprecated which causes an issue with the scatter_plots.py script in the bin directory.

Describe the solution you'd like

A way of inserting the Pearson's R value text into the top left corner of the scatterplots that also works on Seaborn v.0.11.2 and also on legacy v0.9.0.

Describe alternatives you've considered

Use Matplotlib's Axes text() feature, which Seaborn allows, though a simple top left positioning requires some "chewing" and Pearson's r has to be precalculated because this method does not accept a function, and has no convenient positioning via loc as annotate() used to.

The following could possibly do it (at line 35 bin/scatter_plots.py)

    pearr = stats.pearsonr(TPMs.rep1,TPMs.rep2)
    st=f"Pearson's r = {pearr[0]:.4f}"
    g1.ax_joint.text(0.05, 0.95, st, fontsize=15, transform=g1.ax_joint.transAxes, verticalalignment='top')

Additional context

Proof of concept:

#!/usr/bin/env python3
# This works for both Seaborn v0.9.0 and v0.11.2
import seaborn as sns
from scipy import stats
import matplotlib.pyplot as plt

tips = sns.load_dataset("tips")

g = sns.JointGrid(x="total_bill", y="tip", data=tips)
g = g.plot_joint(plt.scatter, color="g", s=40, edgecolor="white")
g = g.plot_marginals(sns.distplot, kde=False, color="g")

# OK here is the deprecated annotate function, This will only work in v0.9.0 with deprecation warning.
# g = g.annotate(stats.pearsonr, template="{stat}: {val:.4f}", stat="Pearson's r", loc="upper left", fontsize=15)
# alternative requires a few more lines:
pearr= stats.pearsonr(tips.total_bill, tips.tip) # precalc
st=f"Pearson's r = {pearr[0]:.4f}" # stringify
g.ax_joint.text(0.05, 0.95, st, fontsize=15, transform=g.ax_joint.transAxes, verticalalignment='top')
g.savefig("d09.pdf", format="pdf")