Use https in links.

Author: eldruin

README.md

@@ -164,8 +164,8 @@ RPi3](https://github.com/bztsrc/raspi3-tutorial) in `C`. Thanks for giving me a
 
 Licensed under either of
 
-- Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)
-- MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
+- Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or <https://www.apache.org/licenses/LICENSE-2.0>)
+- MIT license ([LICENSE-MIT](LICENSE-MIT) or <https://opensource.org/licenses/MIT>)
 
 at your option.