Vagueness in Readme

[v1v2r0b8]

JSON config file has following structure:

{
    "locales": ["en", "de", ...],
    "prefix": "..."
}

Please consider adding here that if one is not going to use translated routes (and hence prefix), they need to remove prefix field from the config rather than leaving it blank. I did it and that caused very subtle bugs (e.g. paths like module1/page1 were being translated to /en/[object Object]/page1).