update cfp status color (#1384)

Co-authored-by: scraly <[email protected]>

Author: scraly

README.md

@@ -261,7 +261,7 @@ All the data (past and coming) are available publicly in JSON:
 * 8: [Conf42.com Machine Learning 2025](https://www.conf42.com/ml2025) - Online <a href="https://www.papercall.io/conf42-machine-learning-2025"><img alt="CFP Conf42.com Machine Learning 2025" src="https://img.shields.io/static/v1?label=CFP&message=until%2007-April-2025&color=green"></a>
 * 8: [KCD SF Bay Area](https://community.cncf.io/kcd-sf-bay-area/) - San Francisco, CA (USA) <a href="https://sessionize.com/kcd-sf-bay-area"><img alt="CFP KCD SF 2025" src="https://img.shields.io/static/v1?label=CFP&message=until%2028-February-2025&color=red"></a>
 * 8: [German VMUG UserCon 2025](https://my.vmug.com/s/event/a4pVs000000NmqLIAS/german-usercon) - Frankfurt (Germany) <a href="https://www.papercall.io/usercon-de"><img alt="CFP German VMUG UserCon 2025" src="https://img.shields.io/static/v1?label=CFP&message=until%2021-March-2025&color=green"></a>
-* 8: [NervesConf US](https://nervesconf.us) - Chattanooga, TN (USA) <a href="https://www.papercall.io/nerves-conf-us"><img alt="CFP NervesConf US" src="https://img.shields.io/static/v1?label=CFP&message=until%2018-March-2025&color=green"></a>
+* 8: [NervesConf US](https://nervesconf.us) - Chattanooga, TN (USA) <a href="https://www.papercall.io/nerves-conf-us"><img alt="CFP NervesConf US" src="https://img.shields.io/static/v1?label=CFP&message=until%2018-March-2025&color=red"></a>
 * 8-10: [global-azure-auckland-2025](https://globalazure.net/) - Online <a href="https://sessionize.com/global-azure-auckland-2025/"><img alt="CFP global-azure-auckland-2025" src="https://img.shields.io/static/v1?label=CFP&message=until%2002-May-2025&color=green"></a>
 * 9: [Weblica 2025](https://weblica.hr/) - Strigova (Croatia) <a href="https://sessionize.com/weblica-2025"><img alt="CFP Weblica 2025" src="https://img.shields.io/static/v1?label=CFP&message=until%2016-February-2025&color=red"></a>
 * 9: [Security BSides Knoxville 2025](https://bsidesknoxville.com/) - Knoxville, TN (USA) <a href="https://www.papercall.io/bsides-knoxville-2025"><img alt="CFP Security BSides Knoxville 2025" src="https://img.shields.io/static/v1?label=CFP&message=until%2016-March-2025&color=red"></a>