Fix wording in readme

Author: angularsen

README.md

@@ -33,7 +33,7 @@ See [Upgrading from 3.x to 4.x](https://github.com/angularsen/UnitsNet/wiki/Upgr
 * [Example: Creating a unit converter app](#example-app)
 * [Example: WPF app using IValueConverter to parse quantities from input](#example-wpf-app-using-ivalueconverter-to-parse-quantities-from-input)
 * [Precision and accuracy](#precision)
-* [Serializable with JSON.NET](#serialization)
+* [Serialize with JSON.NET](#serialization)
 * Extensible with [custom units](https://github.com/angularsen/UnitsNet/wiki/Extending-with-Custom-Units)
 * [Contribute](#contribute) if you are missing some units
 * [Continuous integration](#ci) posts status reports to pull requests and commits