move sentry to non-free.md, update license and name

- https://github.com/getsentry/self-hosted/blob/master/LICENSE
- https://spdx.org/licenses/BUSL-1.1.html
- is not an Open Source license
- The Business Source License 1.1 (BSL) is a Source Available software license, which guarantees that the software's source code will become Open Source after a period of time (up to a maximum of 4 years).

non-free.md

@@ -120,7 +120,9 @@
 - [JIRA](https://www.atlassian.com/software/jira) `⊘ Proprietary` - A professional and extensible issue tracker `Java`
 - [RhodeCode](https://rhodecode.com) `⊘ Proprietary` - On-premise Source Code Management for Mercurial, Git & Subversion. `Python`
 - [BitBucket Server](https://www.atlassian.com/software/bitbucket/server) `⊘ Proprietary` - An enterprise-level Git solution similar to GitLab `Java`
-  
+- [Sentry Self-Hosted](https://github.com/getsentry/self-hosted) - A powerful error tracking platform with wide language support and a robust API. ([Source Code](https://github.com/getsentry/sentry)) `BUSL-1.1` `Python/Django`
+
+
 ## Ticketing
 
 - [Deskpro](https://www.deskpro.com/) `⊘ Proprietary` - On-Premise helpdesk software that includes email, chat, voice & helpcentre publishing. Full visible source code and API.