bley 2.0.0 released

After years of silence, hacking and procrastinating I like to present bley version 2.0.0!

This release contains no changes since the last beta. Please find the changelog since the last real release (0.1.5) below:

• New tool (bleygraph) for creating graphs
• Rename bley.conf to bley.conf.example in the tarball
• Rename README to README.md
• Disable SPF Best Guess by default
• Use Semantic Versioning (http://semver.org/)
• Support for SQLite
• Support for Exim
• Support for Twisted 12, 13 and 14
• Support for publicsuffix.org
• Support for systemd
• Support for postgrey comptatible whitelist_recipients and whitelist_clients lists
• Support for configuring the cache age
• Improve documentation
• Lots of PEP8 and PyFlakes fixes
• Add tests
• Add example logcheck filter rules