Log Message:
Updated py-icalendar to 3.11.4.

3.11.4 (2017-05-10)
-------------------

Bug fixes:

- Don't break on parameter values which contain equal signs, e.g. base64 encoded
  binary data [geier]

- Fix handling of VTIMEZONEs with subcomponents with the same DTSTARTs.
  [geier]

3.11.3 (2017-02-15)
-------------------

Bug fixes:

- Removed ``setuptools`` as a dependency as it was only required by setup.py
  and not by the package.

- Don't split content lines on the unicode ``LINE SEPARATOR`` character
  ``\u2028`` but only on ``CRLF`` or ``LF``.

3.11.2 (2017-01-12)
-------------------

Bug fixes:

- Run tests with python 3.5 and 3.6.
  [geier]

- Allow tests failing with pypy3 on travis.ci.
  [geier]

3.11.1 (2016-12-19)
-------------------

Bug fixes:

- Encode error message before adding it to the stack of collected error messages.

3.11 (2016-11-18)
-----------------

Fixes:

- Successfully test with pypy and pypy3.  [gforcada]

- Minor documentation update.  [tpltnt]