Update README.md

Move SE-0011 from accepted to implemented

Author: jessesquires

README.md

@@ -118,10 +118,10 @@ sooner.
 * [Allow (most) keywords as argument labels](proposals/0001-keywords-as-argument-labels.md) (SE-0001)
 * [Tuple comparison operators](proposals/0015-tuple-comparison-operators.md) (SE-0015)
 * [Constraining `AnySequence.init`](proposals/0014-constrained-AnySequence.md) (SE-0014)
+* [Replace `typealias` keyword with `associatedtype` for associated type declarations](proposals/0011-replace-typealias-associated.md) (SE-0011)
 
 ### Accepted proposals for Swift 2.2
 * [Add a Lazy flatMap for Sequences of Optionals](proposals/0008-lazy-flatmap-for-optionals.md) (SE-0008)
-* [Replace `typealias` keyword with `associatedtype` for associated type declarations](proposals/0011-replace-typealias-associated.md) (SE-0011)
 
 # Other Proposals