Update CHANGELOG for PR #2678 [skip ci]

ponylang · Apr 30, 2018 · c76e590 · c76e590
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -33,6 +33,7 @@ All notable changes to the Pony compiler and standard library will be documented
 
 ### Added
 
+- Added `nosupertype` annotation for subtyping exclusion (RFC 54). ([PR #2678](https://github.com/ponylang/ponyc/pull/2678))
 - `SourceLoc.type_name` method ([PR #2643](https://github.com/ponylang/ponyc/pull/2643))
 - Update with experimental support for LLVM 6.0.0 ([PR #2595](https://github.com/ponylang/ponyc/pull/2595))
 - Improve pattern matching error reporting ([PR #2628](https://github.com/ponylang/ponyc/pull/2628))