[WIP] Add warning about old versions#28

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JulienPalard wants to merge 3 commits intopython:masterfrom

JulienPalard:add-warning-about-old-versions

Commits on May 8, 2019

Add a proto for the deprecation warning for the former version of Python
matrixise
committed
Conditionally write an outdated message with a link to newest available version.
JulienPalard
committed
Generic version, documented.
JulienPalard
committed