message: docs: update appvayor badge
diff: @@ -57,8 +57,8 @@ MIT License
  [npm-url]: https://npmjs.org/package/@kintone/plugin-manifest-validator
  [circleci-image]: https://circleci.com/gh/kintone/plugin-manifest-validator.svg?style=shield
  [circleci-url]: https://circleci.com/gh/kintone/plugin-manifest-validator
  -[appveyor-image]: https://ci.appveyor.com/api/projects/status/pcsvpsj4ff8u4jop/branch/master?svg=true
  -[appveyor-url]: https://ci.appveyor.com/project/teppeis/kintone-plugin-manifest-validator/branch/master
  +[appveyor-image]: https://ci.appveyor.com/api/projects/status/bsoep14h9y0m2a6x/branch/master?svg=true
  +[appveyor-url]: https://ci.appveyor.com/project/teppeis/plugin-manifest-validator/branch/master
  [deps-image]: https://img.shields.io/david/kintone/plugin-manifest-validator.svg
  [deps-url]: https://david-dm.org/kintone/plugin-manifest-validator
  [node-version]: https://img.shields.io/badge/Node.js%20support-v6,v8,v10-brightgreen.svg
  