Version 0.7.1

• Add support for --exclude-file by @dblock. See #302.
• Simple URI cache: Repeated links are only checked once. See #243.
• Silently ignore unsupported schemes (e.g. slack://). See #199.
• Add support for multiple schemes (#214 and #237).
• Add missing Rust docs for lychee-lib (#231).
• Update dependencies.