v0.8.8

This is a minor release that fixes some bug and documentation nits.

Bugfixes:

• Fix sorting in the post index table layout (#475) [@srowen]
• Fix rendering of months in stat plots (#474) [@srowen]
• Fix Python 2 string handling, resulting in several bugs [@matthewwardrop]

Documentation improvements:

• Add guidance to kp preview command about how to access preview when running remotely. [@matthewwardrop]
• Add configuration guide for using SSH authentication GitHub-backed knowledge repositories (#477) [@srowen]
• Improve rendering of options prefixed by two hyphens (e.g. --flags) (#476) [@srowen]