CHANGELOG.md in unicode-age-1.1.0 vs CHANGELOG.md in unicode-age-2.0.0.pre

@@ -1,6 +1,12 @@
 ## CHANGELOG
 
+### 2.0.0.pre
+
+#### Breaking Change
+
+Strings which contain unassigned codepoints (general category of **Cn**), will raise a `Unicode::Age::UnknownAge` exception.
+
 ### 1.1.0
 
 * Detect Unicode 9.0 (Ruby 2.4)
 
 ### 1.0.1