Merge pull request #2964 from ultramiraculous/patch-1

Update changelog to include SE-0093 addition

Author: lattner

CHANGELOG.md

@@ -3,6 +3,8 @@ Note: This is in reverse chronological order, so newer entries are added to the
 Swift 3.0
 ---------
 
+* [SE-0093](https://github.com/apple/swift-evolution/blob/master/proposals/0093-slice-base.md): Slice types now have a `base` property that allows public readonly access to their base collections.
+
 * Nested generic functions may now capture bindings from the environment, for example:
 
     ```swift