fixes pathspec error for commit and tag on windows

("child_process").Spawn on windows can't handle ```'``` in the command line instead it spits out the following

```
>> Error (1) error: pathspec 'version' did not match any file(s) known to git.
>> error: pathspec 'to' did not match any file(s) known to git.
>> error: pathspec '0.5.4.'' did not match any file(s) known to git.
>> error: pathspec ''package.json'' did not match any file(s) known to git.
>> error: pathspec ''bower.json'' did not match any file(s) known to git.
``` 
but when replaced with ```"``` it works. 

So I have inverted the quotes for commit an tag