Fix mistake in README.md

Author: LukasLechnerDev

README.md

@@ -165,7 +165,7 @@ In the respective unit test, we have to pass the testDispatcher to the ViewModel
 ### 11. Cooperative cancellation
 
 UseCase#10 has a problem. It is not able to prematurely cancel the calculation because it is not cooperative regarding cancellation. This leads to wasted device resources and
-memory leaks, as the calculation is not stopped and ViewModel is retained longer than necessary. This use case now fixes this issue. The UI now also has a "Cancel Calculation"
+memory leaks, as the calculation is not stopped and the ViewModel is retained longer than necessary. This use case now fixes this issue. The UI now also has a "Cancel Calculation"
 Button. Note: Only the calculation can be cancelled prematurely but not the `toString()` conversion.
 
 There are several ways to make your coroutines cooperative regarding cancellation: You can use either use `isActive()`, `ensureActive()` or `yield()`.