v2.8.0

• Feature: Use HTTP/1.1 protocol version by default and add new Browser::withProtocolVersion().
  (#162 by @clue)

  This is the preferred HTTP protocol version which also provides decent
  backwards-compatibility with legacy HTTP/1.0 servers. As such, there should
  rarely be a need to explicitly change this protocol version. You can revert
  to legacy HTTP/1.0 like this:

  $browser->withProtocolVersion('1.0')->get($url)->then(…);

• Feature / Fix: Explicitly close connection after response body ends.
  (#161 by @clue)

  This improves support for servers ignoring the Connection: close request
  header that would otherwise keep the connection open and could eventually
  run into a timeout even though the transfer was completed.

• Fixed small issue in code example.
  (#160 by @mmoreram)

• Clean up test suite and add .gitattributes to exclude dev files from exports.
  (#163 by @SimonFrings)