Update LICENSE.md

Explanation:
- I will reserve all rights for any releases on or after 30/9. To be specific, the code at or after this commit (source), and version 6.0 alpha release 2 (v6.0a-r2) and subsequent versions (binary/installer), will have all rights reserved by me.
- Forking this project or pull requests on GitHub will not be affected and restricted even after this change of license, as governed by the Terms of Service of GitHub (see http://choosealicense.com/no-license/ for details)
- It's completely permitted for you to redistribute any form of this software released on or before 29/9 (specifically code before this commit (for source) & v6.0a_r1 (for binary/installer))
- Any person who reproduce, distribute, or create derivative works of any form of releases on or after 30/9 without my prior consent is an infringement of my copyright. I reserve the possibility of taking any lawful actions in order to stop the infringement of the copyright.