Timo Kaufmann 66675b5650 python2.pkgs.ipython: use the proper python2 lexer
Since pygments 2.5 `PythonLexer` refers to python3 [1]. We have to be
explicit if we want to use python2.

[1] https://pygments.org/docs/changelog/
2020-01-23 09:40:14 +01:00
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