updated readme

README.md

@@ -24,4 +24,4 @@ And then just follow the address you see in console. You shoud see something sim
 ## Online playground:
 You can also play with the current deployed version:
 [https://albumentations-demo.herokuapp.com/](https://albumentations-demo.herokuapp.com/)
-It is delpoyes on free service with very limited computing power and can be quite instable.
+It is delpoyed on free service with very limited computing power and can be quite unstable.