Fix completion error
Fix completion error

```shell
ERROR: "tmuxinator completions" was called with arguments ["start",
"sampleproject"]. Usage: "tmuxinator completions [arg1 arg2]"
```

sachin21/tmuxinator,klaxalk/tmux,podung/tmuxinator,sjfloat/tmuxinator,tmuxinator/tmuxinator,guyhughes/tmuxinator,ethagnawl/tmuxinator,azat/tmuxinator,sjfloat/tmuxinator,podung/tmuxinator,tmuxinator/tmuxinator,klaxalk/tmux,jlipps/tmuxinator,jasonchaffee/tmuxinator,cinaeco/tmuxinator,adamstrickland/tmuxinator,danimad/tmuxinator,guyhughes/tmuxinator,ethagnawl/tmuxinator,marcinmagier/tmuxinator,jlipps/tmuxinator,marcinmagier/tmuxinator,klaxalk/tmux,J3RN/tmuxinator,magicalbanana/tmuxinator,sachin21/tmuxinator,adamstrickland/tmuxinator,danimad/tmuxinator,klaxalk/tmux,pczarn/tmuxinator,cinaeco/tmuxinator,marcinmagier/tmuxinator,guyhughes/tmuxinator,marwensaid/tmuxinator,sachin21/tmuxinator,jasonchaffee/tmuxinator,pczarn/tmuxinator,magicalbanana/tmuxinator,J3RN/tmuxinator,azat/tmuxinator,jlipps/tmuxinator,adamstrickland/tmuxinator,J3RN/tmuxinator,podung/tmuxinator,marwensaid/tmuxinator,danimad/tmuxinator,sjfloat/tmuxinator,ethagnawl/tmuxinator,cinaeco/tmuxinator,marwensaid/tmuxinator,magicalbanana/tmuxinator,jasonchaffee/tmuxinator,pczarn/tmuxinator,tmuxinator/tmuxinator,azat/tmuxinator,klaxalk/tmux