Use manually created code file

[vertigo220]

This is a great utility, but it's severely limited due to only using codes from a particular source. After running it, I manually added several codes I found elsewhere and none of them had been used yet. If I could just copy the whole block of codes from the site and paste them into a file then point shift-code to that file, it would allow the process to be semi-automated and to go much faster.

[trs]

Neat idea! I don't have a need for this so I won't be taking this on, but I would accept a pull request to add this. Perhaps an option such as shift-code redeem --file <file path> could handle this.