small message on README

Dependencies

• [2] LMVZU75Q Documentation
• [*] GGYFPXND Initial plugin
• [*] NTRPUMVQ Improved README and added roadmap.

Change contents

• edit in README.md at line 2
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  + **Update 2024-03-17:** I'm still thinking whether I should revive the development of Dracon, for now, I'll be updating it to work with IntelliJ 2023 (but I'll bump to 2024 once released) and to be compatible with the recent changes on Pijul as well.