Easy install via cargo

[jounathaen]

IMHO the simples method of installing this tool (from source) is via this cargo one-liner:

cargo install --git https://github.com/latex-lsp/texlab.git

Maybe this helps other users.

(If this tool would be a crate on crates.io, one could simply install and update it via cargo install texlab. 😉)

[pfoerster]

Thanks for the report. I was not aware that you can install git repositories via cargo. I added the one-liner to the README. Publishing the crate on crates.io is not an easy task as this would involve publishing a lot of other crates like the jsonrpc and jsonrpc-derive crates, which we don't think, are ready yet for use cases other than texlab.

[pfoerster]

Closing this one in favor of #399.