Add a changelog entry

Author: jorisdral

strict-mvar/CHANGELOG.md

@@ -1,5 +1,20 @@
 # Revsion history of strict-mvar
 
+## next version
+
+### Breaking changes
+
+* Remove the `asserts` package flag.
+
+### Non breaking changes
+
+* Add a `StrictMVar` with invariant checking in
+  `Control.Concurrent.Class.MonadMVar.Strict.Checked`.
+* Make the checked/unchecked `StrictMVar` modules drop-in replacements of one
+  another by unifying the interfaces. As a result,
+  `Control.Concurrent.Class.MonadMVar.Strict` now has `newMVarWithInvariant` and
+  `newEmptyMVarWithInvariant` functions that ignore the invariant argument.
+
 ## 1.1.0.0
 
 ### Non breaking changes