Update README.md (OpenAPITools#3353)

add "OpenAPI GeneratorでPythonのクライアントライブラリを作成した by yuji38kwmt" to "Presentations/Videos/Tutorials/Books"

README.md

@@ -595,6 +595,7 @@ Here are some companies/projects (alphabetical order) using OpenAPI Generator in
 - 2019-06-28 [Codewind OpenAPI Tools](https://marketplace.eclipse.org/content/codewind-openapi-tools) in [Eclipse Marketplace](https://marketplace.eclipse.org/) by IBM
 - 2019-06-29 [Codewind OpenAPI Tools](https://marketplace.visualstudio.com/items?itemName=IBM.codewind-openapi-tools) in [Visual Studio Marketplace](https://marketplace.visualstudio.com/) by IBM
 - 2019-07-04 - [REST API のためのコード生成入門 (OpenAPI Generator)](https://gum.co/openapi_generator_ebook_big5) by [William Cheng](https://twitter.com/wing328), [中野暁人](https://github.com/ackintosh), [和田拓朗](https://github.com/taxpon)
+- 2019-07-14 - [OpenAPI GeneratorでPythonのクライアントライブラリを作成した](https://qiita.com/yuji38kwmt/items/dfb929316a1335a161c0) by [yuji38kwmt](https://qiita.com/yuji38kwmt)
 
 ## [6 - About Us](#table-of-contents)