Licensing situation is a mess

[orlp]

1. This is as far as I can see a fork of https://github.com/tikv/minstant, but nowhere is the original mentioned. The Apache license clearly states as conditions of redistribution:

      (b) You must cause any modified files to carry prominent notices
          stating that You changed the files; and

2. The Cargo.toml states this crate is under MIT when it is in fact under Apache.