[python-committers] Python 3.8.0b1 branch cut-off moved to Monday

I received a few pleas to create the 3.8 branch on Monday. Weekends are apparently when unpaid contributors can spend some extra time on their labor of love. Given the current flurry of activity, I see no issue allowing for those extra three days.

Happy hacking, please leave the branch squeaky clean by Sunday EOD AoE.

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