March updates

tl;dr
updates, maybe including:
- cool sites we've lately come across, gathering at https://www.princetonpy.org/meeting/109
- codepen alternatives
- join us at https://8x8.vc/ppug
details:
- The meeting opens at 7pm with a little demo of casefolding, the default lower-casing for unicode, recently on planetpython.
- John made progress on presenting January's html+css+javascript codepen-like interface with greater control and transparency than codepen allows.
- And as always you're invited to update us on your project/idea/question when you introduce yourself, or to just sit back and enjoy the code!
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Future meetings will include:
- data visualization in Pandas
- crash course in deep learning
- learn python from scratch
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And more in our ongoing series:
- Auto-mania explores automated transformation of source code.
- Demysti-py looks at how familiar constructs are implemented.
- Pythonic pitfalls: error fu deepens your understanding of fundamentals.
- Deep reading explores and applies academic articles on deep learning.
- New tool roundup by our resident code hound keeps you updated.