Log Message:
Update to 4.1:

Version 4.1
-----------

(bugfix release, released on July 14th 2015)

- Fix a bug where error messages would include a trailing `None` string.
- Fix a bug where Click would crash on docstrings with trailing newlines.
- Support streams with encoding set to `None` on Python 3 by barfing with
  a better error.
- Handle ^C in less-pager properly.
- Handle return value of `None` from `sys.getfilesystemencoding`
- Fix crash when writing to unicode files with `click.echo`.
- Fix type inference with multiple options.