[Integrated] RFR: Add missing newline to PR progress body

[Robin Westberg]

Changeset: 726cd95c
Author:    Robin Westberg <rwestberg at openjdk.org>
Date:      2020-02-18 15:07:30 +0000
URL:       https://git.openjdk.java.net/skara/commit/726cd95c

Add missing newline to PR progress body

Reviewed-by: ehelin

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