Merge pull request #84 from aws/bump-deps

Increase minimum version minor version of PHPUnit version 5

Author: SamRemis

composer.json

@@ -19,7 +19,7 @@
         "symfony/http-kernel": "~2.3|~3.0|~4.0|~5.0|~6.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "^4.8.35|^5.4.0|^6.0.0",
+        "phpunit/phpunit": "^4.8.35|^5.6.3|^6.0.0",
         "symfony/framework-bundle": "~2.3|~3.0|~4.0|~5.0|~6.0",
         "symfony/yaml": "~2.3|~3.0|~4.0|~5.0|~6.0"
     },