Update README.md

Author: JonathanMagnan

README.md

@@ -123,7 +123,7 @@ Support & Upgrades (1 year) | Yes
 Learn more about the **[PRO Version](https://eval-expression.net/#pro)**
 
 - Starting from version 2.x, there is no longer a free limited version.
-- `LINQ` extension method are free with [EF Classic - Community](https://entityframework-classic.net/)
+- `LINQ` extension method is free with [EF Classic - Community](https://entityframework-classic.net/)
 
 ## Contribute
 The best way to contribute is by **spreading the word** about the library: