Allow phpunit 7.0 and up

SMillerDev · web-flow · commit 819b47230c2e · 2019-03-18T14:35:38.000+01:00
diff --git a/composer.json b/composer.json
@@ -24,7 +24,7 @@
     "lukasoppermann/http-status": "2.*"
   },
   "require-dev": {
-    "phpunit/phpunit": "7.*",
+    "phpunit/phpunit": "~7.0",
     "theseer/autoload": "1.*"
   },
   "autoload": {
