-H Header option is not documented

[maxwellsmart84]

hello! I noticed that in the code there is an option to apply a header to your requests but it is not documented on the readme!

I was unable to get this working until I looked through the source code and saw the option, you guys should add this to the readme and possibly document how this can be done as well with the config.yml file.

I believe the change was made with this PR:
#11

[maxwellsmart84]

#18 --> I went ahead and made a quick PR :-) - I copied the description from source code.

[vkhansen]

Has there been any progress on this?

[maxwellsmart84]

#18