v0.17.0

raindrops 0.17.0 - rack 2.x updates

This release features minor updates to support rack 2.x
while maintaining support for rack 1.2 and later.
As a result, Ruby 1.8.6 compatibility is gone, but
Ruby 1.8.7 probably still works, for now.

There's also a minor warning fix, doc updates, and
the homepage now supports HTTPS (HTTP remains supported)

5 changes since raindrops 0.16.0:
      drop Rack::Utils.bytesize dependency
      gemspec: bump Rack dependency
      linux_inet_diag: GCC attribute format check
      use HTTPS and move homepage to https://bogomips.org/raindrops/
      examples: add yahns config, zbatery is abandoned