Arnaud Ferrand

this PR uses the latest commit for the web browser link

add User-Agent header

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The goal would be to add an HTTP header, "User-Agent", and specify the package version. Ref info here: https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/User-Agent

drop any fetch dependencies

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As now node since version 18 has a `fetch()` function built-in and all browsers have this function, I think it is time to get rid of dependencies. That would lighten...

With the new version passing the parameters (ie, not controlling a mandatory API key parameter) the behaviour is to read the environment variable. in a browser process.env is not defined...

unit tests on fetch wrapper make requests to google/httpbin. Can we improve the unit tests to be isolated and avoid using an internet connection?