Update changelog.md

typo on latest patch version release. should have been 2.0.1
Merge pull request #1525 from nibblebot/patch-1

Update changelog.md
Fix #1355 Return `this` from View and Region-based methods

This tries to draw similarities between the return value behavior of Views
and Regions, and their equivalent methods in Backbone.View.

Conflicts:
	spec/javascripts/view.spec.js