documentation for Pgp module needs to be updated

[zhisme]

Environment

Provide at least:

• Gem version 1.10.3

Expected Behavior

List keys function documentation outdated
private and trust should be added to the example list

Actual Behavior

[34] pry(main)> IOStreams::Pgp.list_keys.first.keys
=> [:private, :key_length, :key_type, :date, :key_id, :email, :name, :trust]

Pull Request

• Consider submitting a Pull Request with a fix for the issue.
• Or, even a Pull request that only includes a test that reproduces the problem.

[zhisme]

also for further improvements I think key_info part should be updated at least with example, what expected input arguments, I mentioned them in #9 (comment)

and for more clear solution, I propose to keep the same output structure for data in both key_info and list_keys
so those should be equal

[35] pry(main)> IOStreams::Pgp.list_keys.first.keys
=> [:private, :key_length, :key_type, :date, :key_id, :email, :name, :trust]
[38] pry(main)> IOStreams::Pgp.key_info(key: key).first.keys
=> [:private, :key_length, :key_type, :date, :key_id, :email, :name]

and why key_info for key returns an array? I expect it to be a simple hash.
let's discuss and I can propose PR for that

[reidmorrison]

I think the reason it returns an array is that for a "single" supplied pgp ascii key it can actually return multiple keys. This is often used to publish multiple keys in a single file, often with different expiry dates.