Stuck at home? Why not release your favourite collection of Rack contributions!

A healthy crop of fixes and new features in this release. Thanks to
everyone who contributed, and welcome to Andrew Konchin, as the newest
recipient of a commit bit.

• New middleware Rack::JSONBodyParser: a better-designed replacement for
  Rack::PostBodyContentTypeParser, with a more appropriate name (given
  that they both only handle JSON natively, having JSON in the name seems
  like a good idea), and with a better set of default behaviours and knobs.
  It is also significantly faster than PostBodyContentTypeParser.

• Rack::PostBodyContentTypeParser: this middleware's interface is a
  bit of a mess, which makes it nearly impossible to improve in a
  backwards-compatible manner. As a result, its use has been deprecated, in
  favour of Rack::JSONBodyParser.

• Several middlewares that set Content-Length headers were fixed to use
  String#bytesize, instead of String#size, which makes multibyte characters
  much happier. (Chris Frank)

• Rack::ResponseCache: Make header detection case-insensitive. (Chris Frank)

• A lot of broken tests and deprecation warnings in the test suite were
  fixed. (Andrew Konchin)

• Rack::Locale: significant correctness fixes, including q=0 handling,
  case insensitivity where appropriate, and better handling of whitespace.
  (Andrew Konchin)

• Rack::StaticCache: several correctness fixes, such as setting a Date
  response header, use UTC in timestamps, and improving the robustness of
  the date rendering.

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