Downgrade phpunit to version 5 in order to keep supporting php 5.6

pmatseykanets · pmatseykanets · commit 60bc683b80f3 · 2018-07-06T14:34:39.000-04:00
diff --git a/composer.json b/composer.json
@@ -26,7 +26,7 @@
     },
     "require-dev": {
         "mockery/mockery": "~1.0",
-        "phpunit/phpunit": "~6.0"
+        "phpunit/phpunit": "5.*"
     },
     "autoload": {
         "psr-4": {
