Getting NoMethodError when creating a link_token

[Jordan Godwin]

Following the docs & README to Create a Link Token gives me the following:

# calling this:
link_token_response = client.link_token_create(link_token_create_request)

# returns this:
NoMethodError: undefined method `create_link_token' for #<Plaid::ApiClient:0x0000aaab2d014130>

Is there something I'm missing here?