message: chore(ci): Add Travis CI status badge
diff: # kintone-dts-gen
  [![CircleCI](https://circleci.com/gh/kintone/dts-gen/tree/master.svg?style=svg)](https://circleci.com/gh/kintone/dts-gen/tree/master)
  +[![Build Status](https://travis-ci.org/kintone/dts-gen.svg?branch=master)](https://travis-ci.org/kintone/dts-gen)
  Type definition for kintone customize and
  Type definition generation tool from kintone form settings.
  