Added correct Appveyor badge

Author: dennisdoomen

README.md

@@ -1,7 +1,7 @@
 ## *"With Fluent Assertions, the assertions look beautiful, natural and most importantly, extremely readable"* (by [Girish](https://twitter.com/girishracharya))
 
 * See [www.fluentassertions.com](http://www.fluentassertions.com/) for more information about the main library.
-* The build status is [![Build status](https://ci.appveyor.com/api/projects/status/h60mq3e5uf5tuout/branch/develop?svg=true)](https://ci.appveyor.com/project/dennisdoomen/fluentassertions/branch/develop)
+* The build status is [![Build status](https://ci.appveyor.com/api/projects/status/ub0dfcmad2cf26tf/branch/master?svg=true)](https://ci.appveyor.com/project/dennisdoomen/fluentassertions-json/branch/master)
 * Join the chat at [![Join the chat at https://gitter.im/dennisdoomen/fluentassertions](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/dennisdoomen/fluentassertions?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)