Add slack-integration plugin checker

Change-Id: Iaf19ac5a3dccb6797fd0a5e0ab0b50f0ad2acdb9
diff --git a/checkers.yaml b/checkers.yaml
index e44d620..2dd1662 100644
--- a/checkers.yaml
+++ b/checkers.yaml
@@ -200,3 +200,8 @@
     repository: "plugins/serviceuser"
     name: "Zuul Check Pipeline"
     description: "Run Zuul jobs on new patchsets"
+
+  - uuid: "zuul-check:plugins_slack-integration"
+    repository: "plugins/slack-integration"
+    name: "Zuul Check Pipeline"
+    description: "Run Zuul jobs on new patchsets"
diff --git a/zuul/main.yaml b/zuul/main.yaml
index 55c1fd8..31812d5 100644
--- a/zuul/main.yaml
+++ b/zuul/main.yaml
@@ -53,3 +53,4 @@
           - plugins/reviewers
           - plugins/saml
           - plugins/serviceuser
+          - plugins/slack-integration