message: bump memchr to 2
diff: @@ -21,7 +21,7 @@ appveyor = { repository = "rust-lang-libs/regex" }
  # For very fast prefix literal matching.
  aho-corasick = "0.6.0"
  # For skipping along search text quickly when a leading byte is known.
  -memchr = "1.0.0"
  +memchr = "2.0.0"
  # For managing regex caches quickly across multiple threads.
  thread_local = "0.3.2"
  # For parsing regular expressions.
  