git: openjdk/skara: forge: add method diffUrl to PullRequest

[Erik Helin]

Changeset: 513a8e3f
Author:    Erik Helin <ehelin at openjdk.org>
Date:      2020-02-20 10:21:39 +0000
URL:       https://git.openjdk.java.net/skara/commit/513a8e3f

forge: add method diffUrl to PullRequest

Reviewed-by: rwestberg

! bots/mlbridge/src/main/java/org/openjdk/skara/bots/mlbridge/ArchiveMessages.java
! bots/tester/src/test/java/org/openjdk/skara/bots/tester/InMemoryPullRequest.java
! forge/src/main/java/org/openjdk/skara/forge/PullRequest.java
! forge/src/main/java/org/openjdk/skara/forge/github/GitHubPullRequest.java
! forge/src/main/java/org/openjdk/skara/forge/gitlab/GitLabMergeRequest.java
! test/src/main/java/org/openjdk/skara/test/TestPullRequest.java