=> 0.8.4

Features:

Signature help popup has syntax highlighting on signature, and emphasizes active parameter (with help from @predragnikolic)
Documentation and default configs have been updated.

Fixes:

* Fix for workspace edits failing to apply
* Fix double '$' or removal of leading characters in some completions (clangd/PHP/Powershell)
* Fix completions occasionally failing while checking view syntax (@rwols)
* Increased protocol compatibility in stdio header parsing (@bscottm)

Deprecations:

`highlight_active_signature_parameter` setting removed, this is now default behaviour.

See https://github.com/tomv564/LSP/releases/tag/0.8.4 for full update details.

Thanks to all contributors & reporters!