Req.url incorrectly evaluated for paths with nested proxy - ApiGateway

GIven the following resource `/testing/{proxy+}` a call to `/testing/creategroup` is evaluated to `/creategroup` rather than `/testing/creatgroup`.

Looking at [getPathWithQueryStringParams](https://github.com/vendia/serverless-express/blob/671f914429e9708bfb1ee6ba76b5947a917592df/src/event-sources/utils.js#L7), it appears that if proxy pathParameter is present, it is simply used, discarding the other parts. Would substituting the value for proxy for the token {proxxy+} into `event.resource` (/testing/{proxy+}) be a potential approach to fixing this?