Change / route to /items

I think it's more obvious if the "all items" route is plural. Also,
this will allow me to eventually put documentation at the root.

README.md

@@ -14,7 +14,7 @@ Create a virtual environment and run it:
 ## Using the API
 The API exposes the following endpoints:
 
-  - GET `/` — return views and downloads for all items that Solr knows about¹. Accepts `limit` and `page` query parameters for pagination of results.
+  - GET `/items` — return views and downloads for all items that Solr knows about¹. Accepts `limit` and `page` query parameters for pagination of results.
   - GET `/item/id` — return views and downloads for a single item (*id* must be a positive integer).
 
 ¹ We are querying the Solr statistics core, which technically only knows about all items that have either views or downloads.

app.py

@@ -59,7 +59,7 @@ class ItemResource:
         resp.media = statistics
 
 api = falcon.API()
-api.add_route('/', AllItemsResource())
+api.add_route('/items', AllItemsResource())
 api.add_route('/item/{item_id:int}', ItemResource())
 
 # vim: set sw=4 ts=4 expandtab: