Update name & repo to reflect renamed repository

Unsure whether we want to go through doing a complete
s/vector/riot/ - I'm not sure there's a whole lot of point.

package.json

@@ -1,5 +1,5 @@
 {
-  "name": "vector-web",
+  "name": "riot-web",
   "productName": "Riot",
   "main": "electron/src/electron-main.js",
   "version": "0.9.0",
@@ -7,7 +7,7 @@
   "author": "Vector Creations Ltd.",
   "repository": {
     "type": "git",
-    "url": "https://github.com/vector-im/vector-web"
+    "url": "https://github.com/vector-im/riot-web"
   },
   "license": "Apache-2.0",
   "files": [