v1.0.0-alpha.6

Changelog

• #13 Improve installation documentation
• #13 Fix Python 2.x incompatibility
• #14 lxml and libxml2/libxslt are no longer needed. It's optional.

Thank you @mmrwoods

v1.0.0-alpha.5

• fix minor bugs

v1.0.0-alpha.4

• Improve email parser
• Improve Slack support
• Override options with command line arguments
• Add HTML email support
• Add nkf support for Japanese (optional)

Thank you @komeda-shinji

v1.0.0-alpha.3

Improve non-ascii charset support in message body