What's new

• Update CONTRIBUTING.md @lucagiove (#396)
• Fix triple asterisk in documentation @PaulBrandUWV (#395)

Features

• Keywords for TRACE and CONNECT HTTP methods @PaulBrandUWV (#390)
• Remove support for python 2 @PaulBrandUWV (#392)

Fixes

• Fix acceptance tests with latest flask and werkzeug @PaulBrandUWV (#391)