fix: remove whitespace added to git-ship message

@kevgo

Here was the output of a git ship command 

```bash
local$ git ship -m 'feature done'
...
[main] git commit -a -m ' feature done'
[main 5a5edb1]  feature done
 1 file changed, 1 insertion(+)
 create mode 100644 feature_file
...
```

The difference was `$*` versus `$@`. `"$@"` returns an array whereas `"$*"` returns a string. 
#202 would have been a way to catch this and will help this from regressing.