Also accept xp-framework/unittest 7.0

Author: thekid

composer.json

@@ -10,7 +10,7 @@
     "php" : ">=5.5.0"
   },
   "require-dev" : {
-    "xp-framework/unittest": "^6.5"
+    "xp-framework/unittest": "^7.0 | ^6.5"
   },
   "autoload" : {
     "files" : ["src/main/php/autoload.php"]