generate README from docs

switch to license compatible with all dependencies

.drone.yml

@@ -7,13 +7,17 @@ steps:
    commands:
      -  rustup component add rustfmt
      -  cargo fmt --all -- --check
+ - name: readme
+   image: msrd0/cargo-readme@sha256:2b916451e576cda54f1e02703fa092b9d5af95bcf48426a1ef42872a19467fd3
+   commands:
+     - cargo readme > ~README.md
+     - cmp -s README.md ~README.md || (printf "README.md need to be updated:\n"; cat ~README.md; exit 1)
  - name: test
    image: rust:1.43.0
    commands:
     - apt update && apt install -y libkeyutils-dev libclang-dev clang pkg-config  
     - echo 'deb http://http.us.debian.org/debian unstable main non-free contrib' >> /etc/apt/sources.list.d/unstable.list && apt update && apt install -y libcryptsetup-dev
     - cargo test
-
  - name: publish
    image: rust:1.43.0
    environment:
@@ -27,3 +31,4 @@ steps:
     - cargo publish --all-features
    when:
     event: tag
+   depends_on: ["fmt", "test", "readme"]