erroneous documentation about configuration file

[farvardin]

Describe the bug

The Readme states:

"The configuration file should be saved in the following location depending on the platform:

Linux/macOS: ~/.config/redshift/redshift.conf (if the environment variable XDG_CONFIG_HOME is undefined) or ${XDG_CONFIG_HOME}/redshift/redshift.conf (if XDG_CONFIG_HOME is defined).

"

https://github.com/jonls/redshift

but it won't work if redshift.config is located into ~/.config/redshift:

"cp redshift.conf ~/.config/redshift/"

it will only work if the conf is ~/.config/redshift.conf instead

as correctly documented in http://jonls.dk/redshift/#configuration-file