v3.1.0

Parse new-style "Nested Schema" sections in markdown docs (#345)

* WIP on parsing newstyle md docs

* Inching closer on parsing param descriptions

* Hack new-style parser into the old parser

* Warn instead of panic

* Cleanup parse_markdown, add doc headers

* Test and clean up a few oddities

* Add tests for nested map parsing

* Complete one TODO

* Also parse top-level Schema

* Handle top-level and nested together

* Fixup description parser

* Skip some more redundant things

* Fix request_max_bytes parsing as request*max*bytes

* Parse top-levels as Attributes not Arguments

* Try to normalize windows line endings to unix before parsing tests

* Fix

* Add CHANGELOG entry