switch to docker, add docker-compose

Author: vyuldashev

.travis.yml

@@ -24,6 +24,7 @@ before_install:
 before_script:
   - travis_retry composer self-update
   - travis_retry composer update --no-progress --no-interaction --prefer-dist
+  - docker-compose up -d
 
 script:
   - composer test

composer.json

@@ -18,8 +18,8 @@
     "queue-interop/amqp-interop": "^0.7"
   },
   "require-dev": {
-    "phpunit/phpunit": "^7.0",
-    "illuminate/events": "5.6.*|5.7.*",
+    "phpunit/phpunit": "^8.0",
+    "illuminate/events": "5.6.*|5.7.*|5.8.*",
     "mockery/mockery": "^1.0"
   },
   "autoload": {