[Integrated] RFR: Improve formatting of ready-for-merge message

[Robin Westberg]

Changeset: 0d1c64f2
Author:    Robin Westberg <rwestberg at openjdk.org>
Date:      2020-01-15 12:45:14 +0000
URL:       https://git.openjdk.java.net/skara/commit/0d1c64f2

Improve formatting of ready-for-merge message

Reviewed-by: ehelin

! bots/pr/src/main/java/org/openjdk/skara/bots/pr/CheckRun.java