Build History for pull/511

Fix docstring line exceeding 80 characters

Clarify that neocaml integration lives on the neocaml side Don't list neocaml alongside the built-in modes — instead mention it as an example of a third-party mode that integrates via the new utop-mode-compat-alist mechanism.

Use plists instead of cons pairs in utop-mode-compat-alist Plist entries like `:next-phrase` and `:discover-phrase` are more readable and easier to extend with new properties in the future than positional cons pairs.

Update README to document mode registration and mention neocaml Document `utop-mode-compat-alist` as the way to add support for new major modes, mention derived mode support, and list neocaml alongside the other supported modes.