Add 0.2.2 changelog

Created by: gaearon

0.2.2 (August 22, 2016)

Build Dependency (react-scripts)

• npm installing a missing dependency now forces a rebuild. (@gaearon in #349)
• Autoprefixer config now includes more commonly supported browsers. (@kripod in #345)
• All the configuration is now documented inline so ejecting doesn’t leave you in the dark. (@gaearon in #362)
• Object.assign() polyfill is now bundled by default. (@gaearon in #399)
• React Native Web now works out of the box. (@grigio in #407)
• Same asset filenames in different folders don’t confuse the server now. (@arunoda in #446)
• The otf font format is now supported. (@A-gambit in #434)
• The new-cap linting rule has been disabled thanks to feedback from Immutable.js users. (@rricard in #470)