Bump version to 0.5.0 and add contributor

Author: jeswr

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@solid/object",
-  "version": "0.4.0",
+  "version": "0.5.0",
   "description": "RDF mapping classes for Solid",
   "main": "dist/mod.js",
   "type": "module",
@@ -33,7 +33,8 @@
   ],
   "contributors": [
     "Matthieu Bosquet (https://github.com/matthieubosquet)",
-    "Samu Lang (https://github.com/langsamu)"
+    "Samu Lang (https://github.com/langsamu)",
+    "Jesse Wright (https://github.com/jeswr)"
   ],
   "license": "MIT",
   "dependencies": {