4.0 release breaks integration with style="rpc" operations

[hss-mateus]

If I understand it correctly, PR #114 added a check in the style attribute of an operation to know if it's an document.

wasabi/lib/wasabi/parser.rb

Line 147 in 3bf2502

soap_document = soap_operation["style"] if soap_operation

Apparently, a comparison is missing here, so it's always considering that it's a document style.
A solution is to just compare with the desired value:

 soap_document = soap_operation["style"] == "document" if soap_operation

[pcai]

Thanks. Can you provide a pr with a test case please?