* Give v2 migration documentation its own document. Incorporate docs from #533
* Fix mis-capitalization of Koa
* Remove unnecessary Dependency section
* Hint at koa-convert enabled compatibility
* Add section on constructing with new
* Clarify es6 constructors are used
* Fix varying capitalization
* Restore mistakenly removed Dependency changes section
* v1.x should not receive feature updates
* Add next() to signature, add missing backticks
* docs++
