Most notably: * env_logger: 0.4 -> 0.5 * hoedown: 5.0.0 -> 6.0.0 * itertools: 0.5 -> 0.6 * lazy_static: 0.1.15 -> 0.2 * regex: 0.1 -> 0.2 * semver: 0.5 -> 0.8 * url: 1.2 -> 1.5 * uuid: 0.3 -> 0.5 (This list is most surely not complete)
This patch removes unused crate imports reported by newer rust versions. Some crates were only required for tests, some only for tests with macro_import - these things were fixed with feature gates.
