Merge branch 'edition-2018' into 'master'
Edition 2018 See merge request !136
@fschutt not this commit right? I haven't published rusttype since. It's true about stb_truetype though, we don't have a consensus around minimum rustc version affecting version see https://github.com/rust-lang-nursery/api-guidelines/issues/123.
I maintain last stable release compatibility and don't bump semver. This means if you need to support an old compiler you should use a version as old as that compiler. So pinning the version, or updating the lock with
cargo update -p stb_truetype --precise x.y.z.