Add functionality to change the map seperator

[dennis-dko]

In my case I want to use the map functionality in the env file with name and url as map[string]string like:

Example:http://example.com:9000

but I can't use this syntax because in the url the map seperator (":") will also used.

My idea is to change the map seperator like you did it with the env seperator.

Thank you for your work. 👍

[caarlos0]

hey, this is already shipped on v10, look for envKeyValSeparator on readme.

Cheers!