mkdocs unicode warning

When running "mkdocs build --clean", I see...

/usr/local/lib/python2.7/dist-packages/mkdocs/cli.py:86: Warning: Click detected the use of the unicode_literals **future** import. This is heavily discouraged because it can introduce subtle bugs in your code. You should instead use explicit u"" literals for your unicode strings. For more information see http://click.pocoo.org/python3/