Update composer.json

Author: timgws

composer.json

@@ -24,8 +24,8 @@
     "elasticsearch/elasticsearch": "~6.1"
   },
   "require-dev": {
-    "phpunit/phpunit": "~4.2|~5.0",
-    "mockery/mockery": "^0.9.4"
+    "phpunit/phpunit": "~4.2|~5.0|~8.0",
+    "mockery/mockery": "^0.9.4|^1.0"
   },
   "autoload": {
     "psr-4": {