Docker build failing

[pjenvey]

   Compiling slog-stdlog v4.0.0
error[E0061]: this function takes 4 parameters but 3 parameters were supplied
   --> /usr/local/cargo/registry/src/github.com-1ecc6299db9ec823/slog-stdlog-4.0.0/lib.rs:244:9
    |
244 |         log::__private_api_log(format_args!("{}", lazy), level, &(target, info.module(), info.file(), info.line()));
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected 4 parameters

error: aborting due to previous error

[pjenvey]

The rustc error is due to slog-stdlog hitting some new incompatibility with the log v0.4.10 crate.

The root problem being cargo install no longer utilizies Cargo.lock as of rust 1.37 (rust-lang/cargo#7169)