Option to disable solargraph integration #281

Your environment

• vscode-ruby version: 0.17.0
• Ruby version: multiple via rbenv, no system-wide ruby
• VS Code version: 1.20.1
• Operating System: Debian Stretch (9.3)
• Hardware (optional):

Expected behavior

When opening the directory of a Rails app, I just want to code :-)

Actual behavior

Since a recent version of this extension, I get a "Solargraph gem not found" message:

Installing the solargraph gem won't help, since (a) I don't have a global Ruby installation, and (b) the VSCode process does not evaluate per-directory .ruby-version files, i.e. loading the correct Ruby shims.

Updating the Gemfile is not possible, because I am not the only person managing the repository (but the only one using VSCode).

I don't want/need code completion (this has never really worked meta-programming-heavy languages like Ruby, so I'm used to not having it), so would like to see an option to disable it. I can also live with a "Don't show again" on the error message.

Steps to reproduce the problem

• manage your Rubies with rbenv
• don't have a system wide Ruby installed
• open a Ruby file