Add `next()` to middleware that injects squel

Related: simcaq/SCRUM#18

src/libs/app.js

@@ -31,6 +31,7 @@ app.use(compression(9));
 // Middleware tha adds the squel object to req
 app.use((req, res, next) => {
     req.sql = squel.select();
+    next();
 });
 app.use(api);