fixed directory separator character

[morfie78]

To fix issue #5 , I changed the hard-coded slash in the file path for the config.yml to use java.io.File.separator instead.

[JRoy]

Why not just replace File file = new File(getDataFolder() + File.separator + "config.yml"); with File file = new File(getDataFolder(), "config.yml");

[morfie78]

I can only imagine that the original code of '\' inside the string with the file name was there because getDataFolder() wasn't returning the ending slash, hence the File.separator. Try it out locally and test. If this is the case, great. If not, I can update my pull request.