fix in README.md

@@ -26,7 +26,7 @@ testing.
 > **Conflict**: With ldap it is difficult to separate the _which_ from the
 > _how_.
 >
-> **Possible solution: Some kind of factory that initializes the concrete
+> **Possible solution**: Some kind of factory that initializes the concrete
 > database by the class of the model and the class of the storage engine.
 >
 > **Alternative**: Instead of a separate factory it might be feasable to