Broken link for 0.x documentation in README

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This is a (check one box):

- [x] Bug Report
- [ ] Feature Request
- [ ] General Query

My version of UI-Router is: (type version)

0.2.18

# Bug Report

#### Current Behavior:

Looking at the current README, you'll see this:

Note: this is the Angular 1.x source for UI-Router version 1.x. If you are looking for the source for UI-Router version 0.x, it can be found here

The here link points to [https://github.com/angular-ui/ui-router/tree/legacy](https://github.com/angular-ui/ui-router/tree/legacy) which 404s.