Simple typo correction (#169)

Mathod -> method

Author: glfabro

docs/Test.md

@@ -18,7 +18,7 @@ use AspectMock\Test as test;
 
 #### *public static* double($classOrObject, array $params = Array ( ) ) 
 `test::double` registers class or object to track its calls.
-In second argument you may pass values that mocked mathods should return.
+In second argument you may pass values that mocked methods should return.
 
 Returns either of [**ClassProxy**](https://github.com/Codeception/AspectMock/blob/master/docs/ClassProxy.md) (when a string was passed)
 or [**InstanceProxy**](https://github.com/Codeception/AspectMock/blob/master/docs/InstanceProxy.md) (when an object was passed).