Update docs.

README.md

@@ -24,3 +24,6 @@ which are checked at start up.
    branches of concern, for specific branch use '^refs/heads/branch$'
 * `J7S_LOOPTIME` - Default: 1.0 minutes between checks of the state of
    of the repo
+* `J7S_REPO_NAME` - Default: "" the repo name which will be added to the
+   data posted to the event. Normally the thing right before .git in the clone
+   url.