Update README.md

Fixes first edition link

Author: MoonTahoe

README.md

@@ -5,7 +5,7 @@ This repository contains the files for the book _Learning React_ by [Alex Banks]
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 | ![Learning React Book Cover](https://raw.githubusercontent.com/MoonHighway/learning-react/second-edition/learning-react.jpg) | If you want to learn how to build efficient React applications, this is your book. This updated edition provides best practices and patterns for writing modern React code including a deep dive on React Hooks.<br><br> **Get the book**: [Amazon](https://www.amazon.com/Learning-React-Modern-Patterns-Developing/dp/1492051721) - [O'Reilly](http://shop.oreilly.com/product/0636920252894.do)<br>**Get React Training**: [Moon Highway](http://www.moonhighway.com)<br><br> |
-| ![Learning React Book v1](https://raw.githubusercontent.com/MoonHighway/learning-react/second-edition/learning-react-v1.jpg) | *Looking for the first edition files? Check out the [first-edition branch](https://github.com/MoonHighway/learning-react/tree/first-edition).*|
+| ![Learning React Book v1](https://raw.githubusercontent.com/MoonHighway/learning-react/second-edition/learning-react-v1.jpg) | *Looking for the first edition files? Check out the [first-edition branch](https://github.com/MoonHighway/learning-react/tree/master).*|
 
 > "This is the React book that’s been missing from the frontend community. Alex and Eve not only discuss React in-depth but cover foundational JavaScript concepts, testing, state management, and more. Plus, they do so with approachable language and humor. I cannot recommend Learning React highly enough." - [Emma Bostian](https://twitter.com/emmabostian), Software Engineer at Spotify