Update README.md

Author: jellodiil

README.md

@@ -14,4 +14,4 @@ We’ve set up an official forum for the book at [https://forums.raywenderlich.c
 | --------------------------------------------------------------------------------- |:-------:|:------------:|
 | [editions/1.0](https://github.com/raywenderlich/flta-materials/tree/editions/1.0) | 1.0     | 2021-06-02   |
 | [editions/2.0](https://github.com/raywenderlich/flta-materials/tree/editions/2.0) | 2.0     | 2021-10-06   |
-| [editions/3.0](https://github.com/raywenderlich/flta-materials/tree/editions/3.0) | 3.0     | YYYY-MM-DD   |
+| [editions/3.0](https://github.com/raywenderlich/flta-materials/tree/editions/3.0) | 3.0     | 2022-09-14   |