Bye body-parser

[Yang-33]

body-parser#raw is no more necessary in line-bot-sdk-nodejs.

Resolve #749

If special line-bot-sdk-nodejs user depends on body-parser#raw, they can use body-parser like this. (I don't believe so)

import express from 'express';
import { middleware as lineMiddleware } from '@line/bot-sdk';
import bodyParser from 'body-parser';

const config = {
  channelAccessToken: process.env.LINE_CHANNEL_ACCESS_TOKEN || '',
  channelSecret: process.env.LINE_CHANNEL_SECRET || '',
};

const app = express();

// PLEASE ADD THIS IF NECESSARY
app.use(bodyParser.raw({
  type: '*/*'
}));

app.post('/webhook', lineMiddleware(config), (req, res) => {
  // your code
});

[tokuhirom]

LGTM