v2.2.1: Check for empty depot path string

Closes #24.

Emacs always passes a depot path to the julia script, but when it's an empty string that
indicates that the depot path elisp variable is not set. This will allow users to set their
own JULIA_DEPOT_PATH without having to configure eglot-jl.

v2.1.2

What's Changed

• Update to LanguageServer.jl v4.1.0 by @non-Jedi in #28

Full Changelog: v2.1.1...v2.1.2

Version 2.1.1

Changed

• update LanguageServer & SymbolServer to their latest versions (#21)
• make sure environments are always resolved, which helps maintaining compatibility with several Julia versions (#20, #21)

Version 2.1.0

Added

• eglot-jl-language-server-project variable allowing to customize the Julia environment in which LanguageServer and SymbolServer are found (#13)

Changed

• updated LanguageServer and SymbolServer to their latest versions.