maturin 0.12.0-beta.6

Build and publish crates with pyo3, rust-cpython and cffi bindings as well as rust binaries as python packages
Documentation 
[build]
  base = "guide"
  publish = "book/"
  command = "curl -L https://github.com/rust-lang/mdBook/releases/download/v0.4.13/mdbook-v0.4.13-x86_64-unknown-linux-gnu.tar.gz | tar xvz && ./mdbook build"