attempt-backport: only run PRs targeted at master

Refs: #77
PR-URL: #90

Author: Fishrock123

scripts/attempt-backport.js

@@ -19,6 +19,8 @@ module.exports = function (app) {
   function handlePrUpdate (event, owner, repo) {
     if (!~enabledRepos.indexOf(repo)) return
 
+    if (event.pull_request.base.ref !== 'master') return
+
     const prId = event.number
     const options = { owner, repo, prId, logger: event.logger }
 
@@ -31,7 +33,7 @@ module.exports = function (app) {
   }
 
   // to trigger polling manually
-  app.get('/pr/:owner/:repo/:id', (req, res) => {
+  app.get('/attempt-backport/pr/:owner/:repo/:id', (req, res) => {
     const owner = req.params.owner
     const repo = req.params.repo
     const prId = parseInt(req.params.id, 10)