Updating NPM dependencies

node_modules/jest-leak-detector/README.md

@@ -7,16 +7,21 @@ Internally creates a weak reference to the object, and forces garbage collection
 ## Example
 
 ```javascript
-let reference = {};
+(async function () {
+  let reference = {};
+  let isLeaking;
 
-const detector = new LeakDetector(reference);
+  const detector = new LeakDetector(reference);
 
-// Reference is held in memory.
-console.log(detector.isLeaking()); // true
+  // Reference is held in memory.
+  isLeaking = await detector.isLeaking();
+  console.log(isLeaking); // true
 
-// We destroy the only reference to the object.
-reference = null;
+  // We destroy the only reference to the object.
+  reference = null;
 
-// Reference is gone.
-console.log(detector.isLeaking()); // false
+  // Reference is gone.
+  isLeaking = await detector.isLeaking();
+  console.log(isLeaking); // false
+})();
 ```