Add Pulp talk from FOSDEM 2020 (#5265)

Author: dkliban

README.md

@@ -724,7 +724,7 @@ Here are some companies/projects (alphabetical order) using OpenAPI Generator in
 - 2020-01-19 - [Why document a REST API as code?](https://dev.to/rolfstreefkerk/why-document-a-rest-api-as-code-5e7p) by [Rolf Streefkerk](https://github.com/rpstreef) at [DEV Community](https://dev.to)
 - 2020-01-28 - [Get Your Serverless Swagger Back with OpenAPI](https://dev.to/matttyler/get-your-serverless-swagger-back-with-openapi-48gc) by [Matt Tyler](https://dev.to/matttyler)
 - 2020-01-30 - [OpenAPI Generatorへのコントリビュート](https://www.yutaka0m.work/entry/2020/01/30/163905) by [yutaka0m](https://github.com/yutaka0m)
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+- 2020-02-01 - [Using OpenAPI to Maximise Your Pulp 3 Experience](https://fosdem.org/2020/schedule/event/openapi/) by [Dennis Kliban](https://github.com/dkliban/) at [FOSDEM](https://fosdem.org/)
 
 ## [6 - About Us](#table-of-contents)