Update CHANGELOG.md

Author: benrimmington

CHANGELOG.md

@@ -7665,6 +7665,7 @@ Swift 1.0
 [SE-0230]: <https://github.com/apple/swift-evolution/blob/master/proposals/0230-flatten-optional-try.md>
 [SE-0235]: <https://github.com/apple/swift-evolution/blob/master/proposals/0235-add-result.md>
 [SE-0242]: <https://github.com/apple/swift-evolution/blob/master/proposals/0242-default-values-memberwise.md>
+[SE-0244]: <https://github.com/apple/swift-evolution/blob/master/proposals/0244-opaque-result-types.md>
 [SE-0245]: <https://github.com/apple/swift-evolution/blob/master/proposals/0245-array-uninitialized-initializer.md>
 [SE-0252]: <https://github.com/apple/swift-evolution/blob/master/proposals/0252-keypath-dynamic-member-lookup.md>
 [SE-0254]: <https://github.com/apple/swift-evolution/blob/master/proposals/0254-static-subscripts.md>