Rustup 1.20.0
I love the changes to the `rustup doc` command.<p>I first learned to program in Perl on a FreeBSD machine. (No GUI, mind you.) I had no way of browsing the internet, so my only source of documentation was via `perldoc`. Perl's documentation was so good I didn't ever need to go online.<p>Now, every time I encounter a new language, one of my favorite things is seeing the documentation available off-line, accessible via the command line. (Either directly from the terminal or opened in a browser.)<p>I've loved seeing the Rust community take documentation and error messages so seriously. It's nice to see this level of care.