[fix] mount: invoke: use adapter’s wrapInvoke if present

Author: chenesan

docs/api/ReactWrapper/invoke.md

@@ -1,6 +1,7 @@
 # `.invoke(propName)(...args) => Any`
 
 Invokes a function prop.
+Note that in React 16.8+, `.invoke` will wrap your handler with [`ReactTestUtils.act`](https://reactjs.org/docs/test-utils.html#act) and call `.update()` automatically.
 
 #### Arguments
 

packages/enzyme/src/ReactWrapper.js

@@ -841,7 +841,9 @@ class ReactWrapper {
         throw new TypeError('ReactWrapper::invoke() requires the name of a prop whose value is a function');
       }
       return (...args) => {
-        const response = handler(...args);
+        const response = typeof this[RENDERER].wrapInvoke === 'function'
+          ? this[RENDERER].wrapInvoke(() => handler(...args))
+          : handler(...args);
         this[ROOT].update();
         return response;
       };