Upgraded Mockery to fix PHP 7.4 build.

Author: Bilge

composer.json

@@ -19,7 +19,7 @@
     },
     "require-dev": {
         "phpunit/phpunit": "^4.8",
-        "mockery/mockery": "^0.9.4"
+        "mockery/mockery": "^1.3"
     },
     "scripts": {
         "test": "phpunit -c test"