HTTPie 0.9.6

• Added Python 3 as a dependency for Homebrew installations
  to ensure some of the newer HTTP features work out of the box
  for macOS users (starting with HTTPie 0.9.4.).
• Added the ability to unset a request header with Header:, and send an
  empty value with Header;.
• Added --default-scheme <URL_SCHEME> to enable things like
  $ alias https='http --default-scheme=https.
• Added -I as a shortcut for --ignore-stdin.
• Added fish shell completion (located in extras/httpie-completion.fish
  in the Github repo).
• Updated requests to 2.10.0 so that SOCKS support can be added via
  pip install requests[socks].
• Changed the default JSON Accept header from application/json
  to application/json, */*.
• Changed the pre-processing of request HTTP headers so that any leading
  and trailing whitespace is removed.