feat: Allow CJS imports

Signed-off-by: Richie Bendall <richiebendall@gmail.com>

src/index.ts

@@ -36,7 +36,7 @@ import _ from "lodash"
 * @param content The content to convert.
 * @param headers HTTP Headers provided with a request.
 */
-export function convertBody(content: Buffer | string, headers?: Headers): string {
+export default function convertBody(content: Buffer | string, headers?: Headers): string {
  // Try to extract content-type header
  const contentType = !_.isNil(headers) ? headers.get("content-type") : null
 
@@ -72,3 +72,4 @@ export function convertBody(content: Buffer | string, headers?: Headers): string
  )
 }
 
+module.exports = convertBody

test.js

@@ -2,7 +2,7 @@ import test from "ava"
 import { Headers } from "node-fetch"
 import { encode } from "iconv-lite"
 import _ from "lodash"
-import { convertBody } from "./src"
+import convertBody from "./src"
 
 test("should support encoding decode, xml dtd detect", (t) => {
  const text = "<?xml version=\"1.0\" encoding=\"EUC-JP\"?><title>日本語</title>"