Hangs on rvm:hook with capistrano 3.3.3

Hello,

I have capistrano 3.2.1 running with capistrano-rvm normally, but after trying to upgrade to 3.3.3, I get hanging process -- seems like forever -- during `rvm:hook` task (also note double -d ~/.rvm commant, which was not the case in 3.2.1):

```
➜ repo git:(capistrano3) ✗ cap test deploy
DEBUG[cc47b8d0] Running /usr/bin/env [ -d ~/.rvm ] on test.myapp.com
DEBUG[cc47b8d0] Command: [ -d ~/.rvm ]
DEBUG[b89780bb] Running /usr/bin/env [ -d ~/.rvm ] on test.myapp.com
DEBUG[b89780bb] Command: [ -d ~/.rvm ]
DEBUG[b89780bb] Finished in 0.544 seconds with exit status 0 (successful).
^C(Backtrace restricted to imported tasks)
cap aborted!
Interrupt:

Tasks: TOP => rvm:hook
(See full trace by running task with --trace)
```