feat: support newest version of rxjs

BREAKING CHANGE: Older version of RxJS will not work with this change

Author: jarlah

README.md

@@ -1,6 +1,6 @@
 # react-rxjs
 
-> A small library for creating applications based on unidirectional data flow with RxJS.
+> A small library for creating applications based on unidirectional data flow with RxJS. Now with support for RxJS 6.
 
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