[Integrated] RFR: merge-bot: give each branch a new number as name

[Erik Helin]

Changeset: a5b74922
Author:    Erik Helin <ehelin at openjdk.org>
Date:      2020-04-15 09:49:28 +0000
URL:       https://git.openjdk.java.net/skara/commit/a5b74922

merge-bot: give each branch a new number as name

Reviewed-by: rwestberg

! bots/merge/src/main/java/org/openjdk/skara/bots/merge/MergeBot.java