Update README.md

Grammatical fix

README.md

@@ -619,7 +619,7 @@ True
 * When `id` was called, Python created a `WTF` class object and passed it to the `id` function. The `id` function takes its `id` (its memory location), and throws away the object. The object is destroyed.
 * When we do this twice in succession, Python allocates the same memory location to this second object as well. Since (in CPython) `id` uses the memory location as the object id, the id of the two objects is the same.
 * So, the object's id is unique only for the lifetime of the object. After the object is destroyed, or before it is created, something else can have the same id.
-* But why did the `is` operator evaluated to `False`? Let's see with this snippet.
+* But why did the `is` operator evaluate to `False`? Let's see with this snippet.
   ```py
   class WTF(object):
     def __init__(self): print("I")