Absent --help

Hi!

I'm trying to set this up, with LanguageClient-NeoVim — and it doesn't work — and I don't know why. Any help?

$ yaml-language-server --help
/usr/local/lib/node_modules/yaml-language-server/node_modules/vscode-languageserver/lib/main.js:700
        throw new Error("Connection input stream is not set. " + commandLineMessage);
        ^

Error: Connection input stream is not set. Use arguments of createConnection or set command line parameters: '--node-ipc', '--stdio' or '--socket={number}'
    at _createConnection (/usr/local/lib/node_modules/yaml-language-server/node_modules/vscode-languageserver/lib/main.js:700:15)
    at Object.createConnection (/usr/local/lib/node_modules/yaml-language-server/node_modules/vscode-languageserver/lib/main.js:647:12)
    at Object.<anonymous> (/usr/local/lib/node_modules/yaml-language-server/out/server/src/server.js:258:42)
    at Module._compile (internal/modules/cjs/loader.js:1076:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1097:10)
    at Module.load (internal/modules/cjs/loader.js:941:32)
    at Function.Module._load (internal/modules/cjs/loader.js:782:14)
    at Module.require (internal/modules/cjs/loader.js:965:19)
    at require (internal/modules/cjs/helpers.js:88:18)
    at Object.<anonymous> (/usr/local/lib/node_modules/yaml-language-server/bin/yaml-language-server:3:1)

Start with the bin/yaml-language-server entry point and trace the command-line handling into out/server/src/server.js. Run yaml-language-server --help while following how the connection is created; done means the command prints usage information and exits without requiring a transport such as --stdio or --node-ipc.