Replace `\ ` with `\x20`

According to
http://coffeescriptcookbook.com/chapters/regular_expressions/heregexes

This was causing an error on a heroku deployed bot.
```
ERROR Unable to load /app/node_modules/hubot-deploy/src/script: SyntaxError: Invalid regular expression: /where\can\i\deploy\([-_\.0-9a-z]+)\?*$/: Unmatched ')'
  at new RegExp (<anonymous>:null:null)
  at module.exports (/app/node_modules/hubot-deploy/src/script.coffee:25:17, <js>:15:19)
  at RegExp (<anonymous>:null:null)
  at Robot.loadFile (/app/node_modules/hubot/src/robot.coffee:216:9, <js>:162:24)
  at module.exports (/app/node_modules/hubot-deploy/index.coffee:4:3, <js>:7:18)
  at fs.js:271:14
  at Robot.loadExternalScripts (/app/node_modules/hubot/src/robot.coffee:256:11, <js>:208:39)
  at /app/node_modules/hubot/bin/hubot:113:13, <js>:122:28

  at Object.oncomplete (fs.js:107:15)
```