remove duplicate postwoman.io demo link

README.md

@@ -1415,7 +1415,7 @@ _See [awesome-sysadmin/Continuous Integration & Continuous Deployment](https://g
 - [Kong](https://konghq.com/kong/) - The World’s Most Popular Open Source Microservice API Gateway and Platform. ([Source Code](https://github.com/Kong/kong)) `Apache-2.0` `Lua`
 - [KrakenD](https://www.krakend.io/) - Open source High-Performance API Gateway. ([Source Code](https://github.com/devopsfaith/krakend)) `Apache-2.0` `Go`
 - [Para](http://www.paraio.org) - Flexible and modular backend framework/server for object persistence, API development and authentication. ([Source Code](https://github.com/erudika/para)) `Apache-2.0` `Java`
-- [Postwoman](https://postwoman.io) - A free, fast and beautiful API request builder. ([Demo](https://postwoman.io), [Source Code](https://github.com/liyasthomas/postwoman)) `MIT` `Nodejs/Vue/Nuxt`
+- [Postwoman](https://postwoman.io) - A free, fast and beautiful API request builder. ([Source Code](https://github.com/liyasthomas/postwoman)) `MIT` `Nodejs/Vue/Nuxt`
 - [Tyk](https://tyk.io) - Fast and scalable open source API Gateway. Out of the box, Tyk offers an API Management Platform with an API Gateway, API Analytics, Developer Portal and API Management Dashboard. ([Source Code](https://github.com/TykTechnologies/tyk)) `MPL-2.0` `Go`
 
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