Log Message:
py-pygls: update to 1.3.1.

What's Changed

    Typo: Apache License missing dash: Affects PyPI License Declaration by \ 
@WilliamRoyNelson in #435
    Add systemd-language-server to implementations by @psacawa in #436
    Update Implementations.md with Chapel's language server by @DanilaFe in #439
    build: v1.3.1 by @tombh in #444