CHANGELOG.md in unicode-sequence_name-1.15.0 vs CHANGELOG.md in unicode-sequence_name-1.15.1

@@ -1,6 +1,10 @@
 ## CHANGELOG
 
+### 1.15.1
+
+- Optimize index size by substituting common words
+
 ### 1.15.0
 
 - Include Emoji sequences which are not fully qualified (VS16 is missing) in index
 - You can use the newly introduced method `Unicode::SequenceName.fully_qualified` 
   if you want to exclude non-fully qualified sequences