Fix a few deprecation warnings#571

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DanielGoldfarb merged 5 commits intomatplotlib:masterfrom

DanielGoldfarb:master

Nov 22, 2022

Commits on Nov 22, 2022

deal with a couple deprecated items (from matplotlib and pandas)
DanielGoldfarb
committed
fix deprecated DataFrame.append()
DanielGoldfarb
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fix DeprecationWarning about invalid \\ escape
Daniel Goldfarb
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Merge branch 'master' of https://github.com/matplotlib/mplfinance
Daniel Goldfarb
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bump version
Daniel Goldfarb
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