uses latest version of cargo dist to create next release

updates version and changelog

bumps internal version

bump version of Tidy

preps release v0.3.8

adds changelog

Merge pull request #50 from sts10/refactor_sd_and_schlinkert

Use a refactored, faster implementation of the Sardinas-Patterson algorithm

adds path to readme to Cargo.toml

Merge pull request #46 from sts10/json

Adds option to print list attributes in JSON format

uses an enum for result of Kraft-McMillan Inequality