Comment # 2 on bug 1154817 from Simon Renger

Also the case with cargo install

------------------------------------------
simon@android-b88d2c9030cc7b02:~/git/quest-api> cargo install actix-web
    Updating crates.io index
error: failed to fetch `https://github.com/rust-lang/crates.io-index`

Caused by:
  invalid version 3 on git_proxy_options; class=Invalid (3)