v1.7.0

What's Changed

• move very important enums into error-handling by @miguelraz in #96
• Fix link typos by @jonathanpallant in #101
• Revised the error-handling slides. by @jonathanpallant in #100
• RefCell is Send but not Sync by @miguelraz in #105
• Update lifetimes.md - typo semicolon in struct member by @amanjeev in #106
• add incrementality to rust-projects-build-time by @miguelraz in #108
• Add embedded training by @jonathanpallant in #104
• Typos by @listochkin in #109

Full Changelog: v1.6.0...v1.7.0