ensure test is using the right type

Author: Chris Santero

JSONAPI.Tests/Core/ModelManagerTests.cs

@@ -88,7 +88,7 @@ public void GetPropertyForJsonKeyTest()
             // Arrange
             var pluralizationService = new PluralizationService();
             var mm = new ModelManager(pluralizationService);
-            Type authorType = typeof(Author).GetType();
+            Type authorType = typeof(Author);
 
             // Act
             var idProp = mm.GetPropertyForJsonKey(authorType, "id");