set APP_URL for heroku
set APP_URL for heroku

when I created new app on heroku and set APP_URL, got a following error.

```
 !    Usage: heroku config:set KEY1=VALUE1 [KEY2=VALUE2 ...]
 !    Must specify KEY and VALUE to set.
```

`heroku apps:info` recently give me two urls, Git URL and Web URL.

ex.

Git URL:       https://git.heroku.com/TESTAPP-cedar-14.git
Web URL:       https://TESTAPP-cedar-14.herokuapp.com/

to set APP_URL I modified regexp to get only Web URL.
is there more good way?
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