+ credits to readme

mstn · mstn · commit 7a9896ad8291 · 2018-03-28T09:19:20.000+02:00
diff --git a/README.md b/README.md
@@ -82,3 +82,7 @@ f = function(v: FixedSizeArray<2, number>) {
 //ok
 f([1,2]);
 ```
+
+## Credits
+
+We use the same trick to assign a numeric literal to length as it was [done](https://github.com/Microsoft/TypeScript/pull/17765) in TS 2.7 for tuples of fixed size.
