Syntax highlighting Python console examples with GFM#

It turns out GitHub Flavored Markdown can apply syntax highlighting to Python console examples, like this one:

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>>> import csv
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>>> with open('eggs.csv', newline='') as csvfile:
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...     spamreader = csv.reader(csvfile, delimiter=' ', quotechar='|')
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...     for row in spamreader:
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...         print(', '.join(row))
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Spam, Spam, Spam, Spam, Spam, Baked Beans
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Spam, Lovely Spam, Wonderful Spam

The trick is to use the following:

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```pycon
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>>> import csv
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>>> with open('eggs.csv', newline='') as csvfile:
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...     spamreader = csv.reader(csvfile, delimiter=' ', quotechar='|')
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...     for row in spamreader:
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...         print(', '.join(row))
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Spam, Spam, Spam, Spam, Spam, Baked Beans
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Spam, Lovely Spam, Wonderful Spam
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```

I figured out the pycon code by scanning through the languages.yml file for linguist, the library GitHub use for their syntax highlighting.

While writing this TIL I also learned how to embed triple-backticks in a code block - you surround the block with more-than-three backticks (thanks to this tip):

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````
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```pycon
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>>> import csv
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>>> with open('eggs.csv', newline='') as csvfile:
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...     spamreader = csv.reader(csvfile, delimiter=' ', quotechar='|')
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...     for row in spamreader:
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...         print(', '.join(row))
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Spam, Spam, Spam, Spam, Spam, Baked Beans
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Spam, Lovely Spam, Wonderful Spam
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```
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````