jenkins: update plugins

Add in the pipeline-github plugin

Signed-off-by: Kelley Spoon <kelley.spoon@linaro.org>
Change-Id: Ie98e63bde05d52e4e7a8d7eab4a5bc682f8e0195
diff --git a/jessie-amd64-jenkins-master/plugins.txt b/jessie-amd64-jenkins-master/plugins.txt
index d477259..24a905d 100644
--- a/jessie-amd64-jenkins-master/plugins.txt
+++ b/jessie-amd64-jenkins-master/plugins.txt
@@ -25,6 +25,7 @@
 multiple-scms:0.8
 parameterized-trigger:2.42
 parameterized-scheduler:1.0
+pipeline-github
 pipeline-github-lib:1.0
 pipeline-githubnotify-step:1.0.5
 pipeline-utility-steps:2.11.0