Align git username

The original PR is always created via the user: greenkeeperio-bot

lib/update-lockfile.js

@@ -59,7 +59,7 @@ module.exports = function updateLockfile (dependency, options) {
   exec('git add package-lock.json 2>/dev/null || true')
   exec('git add yarn.lock 2>/dev/null || true')
   exec('git config user.email "support@greenkeeper.io"')
-  exec('git config user.name "greenkeeper[bot]"')
+  exec('git config user.name "greenkeeperio-bot"')
   const updateMessage = 'chore(package): update lockfile\n\nhttps://npm.im/greenkeeper-lockfile'
   exec(`git commit -m "${updateMessage}"`)
 }