Log Message:
(www/R-webfakes) Updated 1.1.6 to 1.2.0

# webfakes 1.2.0

* The httpbin app now implements the `/brotli`, `/deflate`, `/digest-auth`
  `/forms/post`, `/hidden-basic-auth`, `/range/:n`, `/stream/:n`, `/cache`
  and `/cache/:value` endpoints. With these, it implements all endpoint of
  the otiginal Python httpbin app (#3).

* New middleware `mw_cookie_parser()` to parse a `Cookie` header. Relatedly,
  new `response$add_cookie()` and `response$clear_cookie()` methods to add a
  cookie to a response and to add a header that clears a cookie (#2).

* Parsing query parametes without a value now does not fail.

* New utility function `http_time_stamp()` to format a time stamp for HTTP.

* The httpbin app now implements the endpoints related to cookies (#3).

* The httpbin app now sends the `Date` header in the correct format.

* The `offset` parameter is now optional in the `/links` endpoint of the
  httpbin app.

* `mw_etag()` now does not add an `ETag` header to the response, if there
  is one already. (The comparision is case sensitive.)

* New middleware: `mw_range_parser()` to parse `Range` headers.

# webfakes 1.1.7

* No user visible changes.