Change Default Seperator to ;\n

[regnerus]

In the example configuration the default separator is listed as separator: ';' this sometimes leads to issues could this be changed to separator: ';\n'.

[schmod]

The default separator is grunt.util.linefeed, not ';'.

The example specifically refers to how one would override that default...

That being said, ;\n is indeed a safer example to give for JavaScript, because you could accidentally end up concatenating live code into a // comment.

[arthurvr]

I opened a PR for this. See #122

[schmod]

Looks good. Thanks!