Braintree::OAuthGateway#revoke_access_token ErrorResult is used in an invalid way

[jameswritescode]

General information

• SDK/Library version: 4.7 but present in master
• Environment: N/A
• Language, language version, and OS: N/A

Issue description

When calling on OAuthGateway#revoke_access_token you could possibly get an ErrorResult, but the second parameter of ErrorResult is expected to be a Hash, not a String.

https://github.com/braintree/braintree_ruby/blob/4.7.0/lib/braintree/oauth_gateway.rb#L41

[hollabaq86]

👋 @jameswritescode Thanks for bringing this to our attention! We'll partner with the engineering team that owns OAuth to get this fixed.

[hollabaq86]

for internal tracking, ticket 1906