Use https URLs to refer to rust-lang.org where appropriate.

Also fixes a few outdated links.

Author: eefriedman

CONTRIBUTING.md

@@ -17,8 +17,8 @@ hop on [#rust-internals][pound-rust-internals].
 As a reminder, all contributors are expected to follow our [Code of Conduct][coc].
 
 [pound-rust-internals]: http://chat.mibbit.com/?server=irc.mozilla.org&channel=%23rust-internals
-[internals]: http://internals.rust-lang.org
-[coc]: http://www.rust-lang.org/conduct.html
+[internals]: https://internals.rust-lang.org
+[coc]: https://www.rust-lang.org/conduct.html
 
 ## Feature Requests
 
@@ -207,6 +207,6 @@ it to [Crates.io](http://crates.io). Easier said than done, but very, very
 valuable!
 
 [pound-rust]: http://chat.mibbit.com/?server=irc.mozilla.org&channel=%23rust
-[users]: http://users.rust-lang.org/
+[users]: https://users.rust-lang.org/
 [so]: http://stackoverflow.com/questions/tagged/rust
 [community-library]: https://github.com/rust-lang/rfcs/labels/A-community-library

README.md

@@ -13,8 +13,8 @@ as standard libraries, tools and documentation for Rust.
 
 Read ["Installing Rust"] from [The Book].
 
-["Installing Rust"]: http://doc.rust-lang.org/book/installing-rust.html
-[The Book]: http://doc.rust-lang.org/book/index.html
+["Installing Rust"]: https://doc.rust-lang.org/book/installing-rust.html
+[The Book]: https://doc.rust-lang.org/book/index.html
 
 ## Building from Source
 
@@ -117,7 +117,7 @@ The Rust community congregates in a few places:
 
 [Stack Overflow]: http://stackoverflow.com/questions/tagged/rust
 [/r/rust]: http://reddit.com/r/rust
-[users.rust-lang.org]: http://users.rust-lang.org/
+[users.rust-lang.org]: https://users.rust-lang.org/
 
 ## Contributing