add core-js implementation

tc39 · Oct 20, 2019 · f75683f · f75683f
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diff --git a/README.md b/README.md
@@ -76,6 +76,7 @@ and applications to share a common push-based stream protocol.
 ### Implementations ###
 
 - [RxJS 5](https://github.com/ReactiveX/RxJS)
+- [core-js](https://github.com/zloirock/core-js#observable)
 - [zen-observable](https://github.com/zenparsing/zen-observable)
 - [fate-observable](https://github.com/shanewholloway/node-fate-observable)