Fixed Faraday::Connection#token_auth, Faraday 2.0 - deprecated warning. (#13)

* Fixed Faraday::Connection#token_auth, Faraday 2.0 - deprecated warning.
* Fixed basic_auth method.

Author: martini

lib/zammad_api/transport.rb

@@ -16,11 +16,11 @@ def initialize(config, logger)
       end
       @conn.headers[:user_agent] = 'Zammad API Ruby'
       if config[:http_token] && !config[:http_token].empty?
-        @conn.token_auth(config[:http_token])
+        @conn.request :authorization, 'Token', config[:http_token]
       elsif config[:oauth2_token] && !config[:oauth2_token].empty?
-        @conn.authorization :Bearer, config[:oauth2_token]
+        @conn.request :authorization, 'Bearer', config[:oauth2_token]
       else
-        @conn.basic_auth(config[:user], config[:password])
+        @conn.request :basic_auth, config[:user], config[:password]
       end
     end