CHANGELOG.md in down-5.1.0 vs CHANGELOG.md in down-5.1.1

@@ -1,4 +1,8 @@
+## 5.1.1 (2020-02-04)
+
+* Fix keyword arguments warnings on Ruby 2.7 in `Down.download` and `Down.open` (@janko)
+
 ## 5.1.0 (2020-01-09)
 
 * Fix keyword arguments warnings on Ruby 2.7 (@janko)
 
 * Fix `FrozenError` exception in `Down::ChunkedIO#readpartial` (@janko)