[Python] Drop Python 3.4 support #18073
Description
conda-forge has already dropped it, Pandas dropped it in 0.21, we should also think of dropping support for it.
Reporter: Uwe Korn / @xhochy
Assignee: Antoine Pitrou / @pitrou
PRs and other links:
Note: This issue was originally created as ARROW-2100. Please see the migration documentation for further details.