fix(utils): Minor formatting improvement

Author: byrondover

src/utils.ts

@@ -57,7 +57,10 @@ export function unwrapMapFn (snapshot:firebase.database.DataSnapshot): AFUnwrapp
       $value: unwrapped
     };
   }
-  Object.defineProperty(unwrapped, '$key', {value: snapshot.ref.key, enumerable: false});
+  Object.defineProperty(unwrapped, '$key', {
+    value: snapshot.ref.key,
+    enumerable: false
+  });
   Object.defineProperty(unwrapped, '$exists', {
     value: () => {
       return snapshot.exists();