Update composer.json

Author: akagibi

composer.json

@@ -8,7 +8,9 @@
         "cms",
         "craftcms",
         "craft-plugin",
-        "string urldecode"
+        "string urldecode",
+        "urldecode",
+        "php"
     ],
     "support": {
         "docs": "https://github.com/akagibi/stringurldecode/blob/master/README.md",
@@ -22,7 +24,7 @@
         }
     ],
     "require": {
-        "craftcms/cms": "^3.0.0"
+        "craftcms/cms": "^3.1.0"
     },
     "autoload": {
         "psr-4": {