Update README.md

README.md

@@ -10,7 +10,7 @@ This solution is originally prepared to be a real-world example for the **Master
 
 ![abp-book](etc/images/abp-book.png)
 
-**The book is the only source that explain the solution**. The solution is highly referred in the *Understanding the Reference Solution*, *Domain Driven Design* and other parts of the book.
+**The book is the only source that explains the solution**. The solution is highly referred in *Understanding the Reference Solution*, *Domain Driven Design* and other parts of the book.
 
 **You can order the book on [Amazon](https://www.amazon.com/gp/product/B097Z2DM8Q) or on [Packt's website](https://www.packtpub.com/product/mastering-abp-framework/9781801079242).**