Fix typo in readme.md

readme.md

@@ -209,7 +209,7 @@ Assert.AreEqual("SomeValue", value);
 
 ### Compilation
 
-**LightInject** uses dynamic code compilation either in the form of System.Reflection.Emit or compiled expression trees. When a service is requested from the container, the code needed for creating the service instance is generated and compiled and a delegate for that code is stored for lookup later on so that we only compile it once. These delegates are stored in an AVL tree that ensures maximal performance when looking up a delegate for a given service type. If fact, looking up these delegates is what sets the top performing containers apart. Most high performance container emits approximately the same code, but the approach to storing these delegates may differ. 
+**LightInject** uses dynamic code compilation either in the form of System.Reflection.Emit or compiled expression trees. When a service is requested from the container, the code needed for creating the service instance is generated and compiled and a delegate for that code is stored for lookup later on so that we only compile it once. These delegates are stored in an AVL tree that ensures maximal performance when looking up a delegate for a given service type. In fact, looking up these delegates is what sets the top performing containers apart. Most high performance container emits approximately the same code, but the approach to storing these delegates may differ. 
 
 **LightInject** provides lock-free service lookup meaning that no locks are involved for getting a service instance after its initial generation and compilation. The only time **LightInject** actually creates a lock is when generating the code for a given service.  That does however mean a potential lock contention problem when many concurrent requests asks for services for the first time.