CHANGELOG.md in safe_operation-1.0.0 vs CHANGELOG.md in safe_operation-2.0.0

@@ -1,8 +1,20 @@
 # CHANGELOG
 
 ## Unreleased
 
+## 2.0.0
+
+- Drop support for v1.0.0
+- v2.0.0 redesigned the API of SafeOperation:
+
+  SafeOperation.run
+
+  SafeOperation#value_or
+  SafeOperation#value_or_else
+  SafeOperation#and_then
+  SafeOperation#or_else
+
 ## 1.0.0
 
 First implementation ([#1][pr1]) - 2017.07.09
 
 [pr1]: https://github.com/juanitofatas/safe_operation/pull/1