v0.4.0

This is a new release to address the incompatibility between matrix-python v0.3.2 and Synapse v1.38.0+. See #320 for the full details.

Changes since v0.3.2:

• Experimental support for encrypted rooms has been implemented. Note that
  the functionality is disabled by default, but can be enabled by first
  installing the native libolm library (v3.0.0+), then the
  encryption-related python dependencies with:

  pip install matrix-client[e2e]
  

• Add an option (use_authorization_header) for sending auth tokens using the HTTP Authorization
  header instead of the access_token query parameter.

• Add the ability to set the room name and whether room federation is allowed with create_room().

• Catch MissingSchema errors that could be raised by the http library
  (see issue #221 for details).

• Add urllib3 as an explicit dependency.

• Include the SDK version in the User Agent of requests.

• Speed up membership handling code in rooms.

• Use lexicographical sort to room displayname calculation.

• Add a new method, whoami, for determining the Matrix ID of the
  currently authenticated user.

• Better support for global vs. per-room display names.

• Better handling of users who lack a display name.

• Add support for specifying a filename when uploading media.

• Numerous fixes to the tests.