Should use $XDG_CONFIG_HOME/ghorg for config file

[liljenstolpe]

Is your feature request related to a problem? Please describe.
On most !OSX unix-like boxen $XDG_CONFIG_HOME (usually $HOME/.config) is a single place to look for all of your application configuration files, making it easy to version control, etc. Having ghorg use $HOME/ghorg leads to a messier $HOME, and yet one more place to hoover things up.

Describe the solution you'd like

If $XDG_CONFIG_HOME is defined, store your configs in $XDG_CONFIG_HOME/ghorg. Otherwise, default - probably to $HOME/.config/ghorg - a number of CLI OSX applications use that now, as well.

Describe alternatives you've considered

Symlinks... :(

Additional context

[gabrie30]

Changes are now on master and will be included in the next release. Please let me know if you find any issues. Thanks again @liljenstolpe!

[liljenstolpe]

Thank's @gabrie30