switch to docker, add docker-compose

Author: vyuldashev

composer.json

@@ -18,7 +18,7 @@
     "queue-interop/amqp-interop": "^0.7"
   },
   "require-dev": {
-    "phpunit/phpunit": "^8.0",
+    "phpunit/phpunit": "^7.0",
     "illuminate/events": "5.6.*|5.7.*|5.8.*",
     "mockery/mockery": "^1.0"
   },