run cargo with --color=always

[nick1udwig]

Problem

Resolves #102

Solution

The command called by std::process::Command can tell if it is being printed to terminal -- like when we use Stdio::inherit -- vs when it is being piped -- like when we use Stdio::piped. We changed to piping and lost the color. Fix by passing --color=always to cargo.

Docs Update

N/A

Notes

FYI @tadad