add status endpoint to '/'

paas were trying to ascertain if notify was up by looking at '/', for cert
renewal. This commit adds the status endpoint to '/', so we're not mistakenly
left for our cert to expire

app/status/healthcheck.py

@@ -9,6 +9,7 @@ from app import db, version
 status = Blueprint('status', __name__)
 
 
+@status.route('/', methods=['GET'])
 @status.route('/_status', methods=['GET', 'POST'])
 def show_status():
     if request.args.get('simple', None):