message: allow trailing slash in standard-library redirects
  fixes
diff: @@ -111,6 +111,12 @@ impl CratesfyiHandler {
  router.get("/std", rustdoc::RustLangRedirector::new("std"), "std");
  router.get("/test", rustdoc::RustLangRedirector::new("test"), "test");
  + router.get("/alloc/", rustdoc::RustLangRedirector::new("alloc"), "alloc/");
  + router.get("/core/", rustdoc::RustLangRedirector::new("core"), "core/");
  + router.get("/proc_macro/", rustdoc::RustLangRedirector::new("proc_macro"), "proc_macro/");
  + router.get("/std/", rustdoc::RustLangRedirector::new("std"), "std/");
  + router.get("/test/", rustdoc::RustLangRedirector::new("test"), "test/");
  +
  router.get("/releases", releases::recent_releases_handler, "releases");
  router.get("/releases/feed",
  releases::releases_feed_handler,
  