[Integrated] RFR: git-pr: rename "update" to "set"

[Erik Helin]

Changeset: 5c2736f0
Author:    Erik Helin <ehelin at openjdk.org>
Date:      2020-02-18 13:15:53 +0000
URL:       https://git.openjdk.java.net/skara/commit/5c2736f0

git-pr: rename "update" to "set"

Reviewed-by: rwestberg

! cli/src/main/java/org/openjdk/skara/cli/GitPr.java