add "Buy Manning" badge

Author: getify

README.md

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 This book is a balanced, pragmatic look at FP in JavaScript. The first edition is now complete. Read here online **for free**, or:
 
 <p align="center">
- <a href="https://leanpub.com/fljs"><img src="https://img.shields.io/badge/Buy-Leanpub-yellow.svg" title="Buy on Leanpub" alt="Buy on Leanpub"></a> <a href="http://amazon.fljsbook.com"><img src="https://img.shields.io/badge/Buy-Amazon-yellow.svg" title="Buy on Amazon" alt="Buy on Amazon"></a>
+ <a href="https://leanpub.com/fljs"><img src="https://img.shields.io/badge/Buy-Leanpub-yellow.svg" title="Buy on Leanpub" alt="Buy on Leanpub"></a> <a href="http://manning.fljsbook.com"><img src="https://img.shields.io/badge/Buy-Manning-yellow.svg" title="Buy on Manning" alt="Buy on Manning"></a> <a href="http://amazon.fljsbook.com"><img src="https://img.shields.io/badge/Buy-Amazon-yellow.svg" title="Buy on Amazon" alt="Buy on Amazon"></a>
 </p>
 
 "Functional-Light JavaScript" explores the core principles of functional programming (FP) as they are applied to JavaScript. But what makes this book different is that we approach these principles without drowning in all the heavy terminology. We look at a subset of FP foundational concepts that I call "Functional-Light Programming" (FLP) and apply it to JavaScript.
@@ -47,7 +47,9 @@ But I want you to be able to apply some of the fundamentals of FP to your JavaSc
 
 This book has been published [and is now available for purchase on Leanpub](https://leanpub.com/fljs/). I'll also be trying to work out an option to sell print book copies, but that part is still uncertain.
 
-[![Buy on Leanpub](https://img.shields.io/badge/Buy-Leanpub-yellow.svg)](https://leanpub.com/fljs)
+<p align="center">
+ <a href="https://leanpub.com/fljs"><img src="https://img.shields.io/badge/Buy-Leanpub-yellow.svg" title="Buy on Leanpub" alt="Buy on Leanpub"></a> <a href="http://manning.fljsbook.com"><img src="https://img.shields.io/badge/Buy-Manning-yellow.svg" title="Buy on Manning" alt="Buy on Manning"></a> <a href="http://amazon.fljsbook.com"><img src="https://img.shields.io/badge/Buy-Amazon-yellow.svg" title="Buy on Amazon" alt="Buy on Amazon"></a>
+</p>
 
 If you'd like to contribute financially towards the effort (or any of my other OSS work) aside from purchasing the book, I do have a [patreon](https://www.patreon.com/getify) that I would always appreciate your generosity towards.