Update to async-test-utilities v2 alpha 2

Author: WyriHaximus

composer.json

@@ -17,7 +17,7 @@
         "react-parallel/contracts": "^1.0",
         "react/event-loop": "^1.1",
         "react/promise": "^2.7",
-        "wyrihaximus/async-test-utilities": "^2.0.0-alpha1",
+        "wyrihaximus/async-test-utilities": "^2.0.0-alpha2",
         "wyrihaximus/iterator-or-array-to-array": "^1.1",
         "wyrihaximus/pool-info": "^1.0"
     },