alexpopov
In `Collection+RandomKit` the extension on line 81 containing `uncheckedRandom(in:using)` fails to compile because in Swift 4.1 `IndexDistance` is now always `Int` and the compiler sees it as an invalid redeclaration. Fix: the whole extensions can be removed. Similarly in the following extension on line 90, `IndexDistance` is used as a generic constraint but it is no longer generic (since it's always `Int`). Additionally, a warning is issued on line 96 since `IndexDistance` is deprecated. Fix: removing the `IndexDistance` constraint and optionally resolve the warning. All macOS tests pass with these changes. As easy as these fixes are, I'm not sure how to submit a PR since this probably shouldn't be merged into master without mention in the README regarding which version to use in dependency managers depending on the Swift version being used.