Browser fetch with display url in returned JSON

The v2.0.0 version adds the display url with property doc.url to the return JSON with wiki markup source. This url can be used as link to refer to the source from which the processed Wiki markdown was downloaded.

v1.8.0 updated for wtf_wikipedia v7.3.0

The wtf_fetch version v1.8.0 was updated for wtf_wikipedia v7.3.0

Updated version for wtf_wikipedia v7.3.0

Browser fetch works

This versions allows the wiki fetch within the browser. For NodeJS implementation there is something more fix.