Add random PIS return

Signed-off-by: Fred Boniface <fred@fjla.uk>

src/routes/pis.routes.js

@@ -4,5 +4,6 @@ const pisController = require('../controllers/pis.controllers');
 
 router.get('/origdest/:start/:end', pisController.byOrigDest);
 router.get('/code/:code', pisController.byCode);
+router.get('/code/random', pisController.random);
 
 module.exports = router;