v0.3.0

For the first 'announced' release, we've removed the auto-installation of chai (#18).

For those migrating from the v0.2.0 version, if you use chai assertions in your project you should make sure to explicitly install it: npm install chai. If you need to access the chai instance you should now get it through require('chai'). If you use should-style assertions you should set it up manually now, by adding require('chai/register-should') in your tests, or e.g. in your Truffle config. Check out OpenZeppelin's upgrade commit in case it might be helpful: cf7375d.