Adding QCon London (#1117)

Author: jespino

README.md

@@ -675,6 +675,7 @@ All the data (past and coming) are available publicly in JSON:
 * 1-3: [Java Land](https://www.javaland.eu/de/home/) - Nürburg (Germany) <a href="https://my.doag.org/events/javaland/cfp/"><img alt="CFP Java Land 2025" src="https://img.shields.io/static/v1?label=CFP&message=until%2025-September-2024&color=green"></a>
 * 1-4: [KubeCon + CloudNativeCon EU 2025](https://events.linuxfoundation.org/kubecon-cloudnativecon-europe-2025/) - London (UK)
 * 2-3: [Alchemy Conf 2025](https://alchemyconf.com/) - Braga (Portugal) <a href="https://www.papercall.io/alchemy-conf-2025"><img alt="CFP Alchemy Conf 2025" src="https://img.shields.io/static/v1?label=CFP&message=until%2030-September-2024&color=green"></a>
+* 7-9: [QCon London](https://qconlondon.com/) - London (UK)
 * 10: [Conf42.com Large Language Models (LLMs) 2025](https://www.conf42.com/llm2025) - Online <a href="https://www.papercall.io/conf42-large-language-models-llms-2025"><img alt="CFP Conf42.com Large Language Models (LLMs) 2025" src="https://img.shields.io/static/v1?label=CFP&message=until%2010-March-2025&color=green"></a>
 * 14-17: [Explore DDD 2025](http://exploreddd.com) - Denver, CO (USA) <a href="https://sessionize.com/explore-ddd-2025"><img alt="CFP Explore DDD 2025" src="https://img.shields.io/static/v1?label=CFP&message=until%2030-August-2024&color=green"></a>
 * 15-17: [CYBERSEC](https://cybersec.ithome.com.tw/) - Taipei (Taiwan)