Typo fix

README.md

@@ -3,6 +3,6 @@ Npgsql Entity Framework Core provider for PostgreSQL
 
 Npgsql.EntityFrameworkCore.PostgreSQL is an Entity Framework Core provider built on top of
 [Npgsql](https://github.com/npgsql/npgsql). It allows you to use the EF Core O/RM with
-PostreSQL.
+PostgreSQL.
 
 Documentation is available on [the Npgsql site](http://www.npgsql.org/efcore/index.html).