Coding style: fix Lint/ParenthesesAsGroupedExpression offense

Author: n-rodriguez

lib/netbox_client_ruby/api/ipam/ip_address.rb

@@ -38,7 +38,7 @@ def interface
 
         return nil unless interface_data
 
-        if interface_data.key? ('virtual_machine')
+        if interface_data.key?('virtual_machine')
           Virtualization::Interface.new interface_data['id']
         else
           DCIM::Interface.new interface_data['id']