Add a render-readmes script

This script renders the README of every published crate and uploads
it to S3.

Author: kureuil

Cargo.lock

@@ -27,6 +27,7 @@ git2 = "0.6.4"
 flate2 = "0.2"
 semver = "0.5"
 url = "1.2.1"
+tar = "0.4.13"
 
 postgres = { version = "0.14.0", features = ["with-time", "with-openssl", "with-serde_json", "with-chrono"] }
 r2d2 = "0.7.0"