fix: typo

Author: typicode

src/server/router/validate-data.js

@@ -19,7 +19,7 @@ module.exports = (obj) => {
     throw new Error(
       `Data must be an object. Found ${
         Array.isArray(obj) ? 'array' : typeof obj
-      }
+      }.
       'See https://github.com/typicode/json-server for example.`,
     )
   }