Remove body-parser deps in example (#845)

* chore: remove unused body-parser for examples/1-standard

* chore: remove body-parser for examples/2-standard-multiple-api-specs

* chore: remove unused body-parser for examples/3-eov-operations

* chore: remove unused body-parser for examples/4-eov-operations-babel

* chore: remove body-parser for examples/5-custom-operation-resolver

* chore: remove body-parser for examples/6-multi-file-spec

* chore: remove body-parser for examples/7-response-date-serialization

* chore: remove body-parser for examples/8-top-level-discriminator

Author: yutak23

Diff for: examples/1-standard/app.js

@@ -1,6 +1,5 @@
 const express = require('express');
 const path = require('path');
-const bodyParser = require('body-parser');
 const http = require('http');
 const { Pets } = require('./services');
 const OpenApiValidator = require('express-openapi-validator');