Update LICENSE copyright holder to MCP Contributors

Changes GitHub to MCP Contributors in the LICENSE file to better reflect
the project's community-driven nature.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: domdomegg

LICENSE

@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2025 GitHub
+Copyright (c) 2025 MCP Contributors
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal