Comments and update changelog

Author: mirko-plowtech

HISTORY.md

@@ -1,4 +1,8 @@
-## 1.0.0
+## 2.0.0
+
+* Simplify API around deferred actions.
+
+## 1.0.1
 
 * Fork from `rescript-react-update`. 
 * Re-design and extend the API.

src/Internal_Map.res

@@ -1,3 +1,6 @@
+// Polyfill for Map taken from RescriptCore
+// Ref. https://github.com/rescript-association/rescript-core/blob/main/src/Core__Map.res
+
 type t<'k, 'v> = Js.Map.t<'k, 'v>
 
 @new external make: unit => t<'k, 'v> = "Map"