As was mentioned in the release notes of 1.5, the following default
configurations are now removed:

haskell-ide-engine
-> use haskell-language-server, see lsp.sublimetext.io for instructions
rlang
-> use the LSP-R helper package: https://packagecontrol.io/packages/LSP-R

New Helper Packages

Features and Fixes

Fix a bug where code actions would be requested for transient
views (Raoul Wols)
Clear all status messages when session ends (Janos Wortmann)
This fixes a bug where if you disable the LSP package while
a language server is reporting server-initiated progress, the
progress message would remain visible in the Status Bar.
CI is once again enabled (#1679) (Rafał Chłodnicki)
os.path.relpath may throw an exception on Windows (Raoul Wols)
This fixes a bug where if you use Find References on Windows,
the response handler could fail by not catching this exception.
Rename code_action_on_save_timeout_ms to
on_save_task_timeout_ms (#1728) (Rafał Chłodnicki)
This allows you to adjust the timeout for formatting as well.