www/yaws: Update to version 2.1.0

Hello,

There is a new release of www/yaws which adds Erlang/OTP 24 support.
  https://github.com/erlyaws/yaws/releases/tag/yaws-2.1.0

I note this is required in order for SSL to work, so an update to the
port would be much appreciated.

Thanks very much.
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Peggy Wilkins                                     mozart@lib.uchicago.edu
Digital Library Development Center      The University of Chicago Library