message: test: use Base64.encode instead of Buffer.from
diff: import { KintoneAPIClient } from "../KintoneAPIClient";
  +import { Base64 } from "js-base64";
  describe("KintoneAPIClient", () => {
  describe("constructor", () => {
  @@ -23,9 +24,7 @@ describe("KintoneAPIClient", () => {
  };
  const client = new KintoneAPIClient({ subdomain, auth });
  expect(client.getHeaders()).toEqual({
  - "X-Cybozu-Authorization": Buffer.from(
  - `${USERNAME}:${PASSWORD}`
  - ).toString("base64")
  + "X-Cybozu-Authorization": Base64.encode(`${USERNAME}:${PASSWORD}`)
  });
  });
  it("Session auth", () => {
  