Update dropcenter main site

non-free.md

@@ -33,7 +33,7 @@
 
 ### File Transfer & Synchronization
 
-- [Dropcenter](http://projet.idleman.fr/dropcenter/) - Upload files by simple drag-n-drop. ([Source Code](https://github.com/ldleman/dropcenter)) `CC-BY-NC-SA-3.0` `PHP`
+- [Dropcenter](http://projet.idleman.fr/login) - Upload files by simple drag-n-drop. ([Source Code](https://github.com/ldleman/dropcenter)) `CC-BY-NC-SA-3.0` `PHP`
 - [FileRun](http://www.filerun.com/) - Complete solution for your files with integration with Google and Office. ([Demo](http://www.filerun.com/demo)) `⊘ Proprietary` `PHP`
 - [Resilio Sync](https://www.resilio.com/) - Proprietary peer-to-peer file synchronisation tool. `⊘ Proprietary` `Unknown`
 - [Yetishare](https://yetishare.com) - Powerful file hosting script with support for Amazon S3, Wasabi, Backblaze, local, direct and SFTP storage. ([Demo](https://fhscript.com)) `⊘ Proprietary` `PHP`