Undesrscores are valid characters in ZApp names for the ZApp Shop

zoe_api/web/__init__.py

@@ -50,8 +50,8 @@ def web_init(api_endpoint) -> List[tornado.web.URLSpec]:
         tornado.web.url(r'/websocket', zoe_api.web.websockets.WebSocketEndpointWeb, route_args, name='websocket'),
 
         tornado.web.url(r'/zapp-shop', zoe_api.web.zapp_shop.ZAppShopHomeWeb, route_args, name='zappshop'),
-        tornado.web.url(r'/zapp-shop/logo/([0-9a-z\-.]+)', zoe_api.web.zapp_shop.ZAppLogoWeb, route_args, name='zappshop_logo'),
-        tornado.web.url(r'/zapp-shop/start/([0-9a-z\-.]+)', zoe_api.web.zapp_shop.ZAppStartWeb, route_args, name='zappshop_start'),
+        tornado.web.url(r'/zapp-shop/logo/([0-9a-z_\-.]+)', zoe_api.web.zapp_shop.ZAppLogoWeb, route_args, name='zappshop_logo'),
+        tornado.web.url(r'/zapp-shop/start/([0-9a-z_\-.]+)', zoe_api.web.zapp_shop.ZAppStartWeb, route_args, name='zappshop_start'),
 
         tornado.web.url(r'/status', zoe_api.web.status.StatusEndpointWeb, route_args, name='status')
     ]