Initializer config variable changed in 1.0.0.beta2 - needs to be documented

[gentle-noah]

This is a config for initialization that works with 1.0.0.beta2:

Argyle.configure do |config|
  config.key         = Rails.application.secrets.plaid_key         # Public key from Plaid
  config.secret      = Rails.application.secrets.plaid_secret  # Secret from Plaid
  config.client_id = Rails.application.secrets.plaid_client_id  # Client ID from Plaid
  config.product     = 'connect' # Product
end

The key is changing customer_id (which works with v0.2.0) to client_id.

[gentle-noah]

Actually just saw the proper documentation change in the branch specific read me, would be great to link to that branch when talking about updating to the new version for Stripe ACH to work.