Update list of countries in composer.json

Author: JozefVerhoef

composer.json

@@ -2,18 +2,23 @@
   "name": "postcode-nl/api-client",
   "description": "A client to the Postcode.nl Address Api for international address validation. You will need to create an account at https://developer.postcode.eu/documentation/.",
   "keywords": [
-    "postcode",
-    "netherlands",
-    "germany",
-    "belgium",
-    "luxembourg",
-    "austria",
-    "switzerland",
     "api",
     "rest",
     "client",
     "address",
-    "autocomplete"
+    "autocomplete",
+    "postcode",
+    "austria",
+    "belgium",
+    "denmark",
+    "france",
+    "germany",
+    "luxembourg",
+    "netherlands",
+    "norway",
+    "spain",
+    "switzerland",
+    "united kingdom"
   ],
   "license": "BSD-2-Clause",
   "authors": [