v0.8.1

• #117 Fix issue with renaming clients with tmux 2.7 on BSD/macOS
  machines.
• #121 Support literal=True (-l) in Pane.send_keys
  from @ritiek
• #131 Fix for unicode commands in Python 2, thanks @myw
• #172 Support for next-X.Y versions from @sloria
• #120 capture_pane support for Pane
• #119 display_message support for Pane
• Sort imports with isort
• Add sphinxcontrib-napoleon package for documentation
• Move docstrings over to numpy's style