Merge #18: Update readme

ce16b46 Update readme (Tobin C. Harding)

Pull request description:

  The site is up and running now, lets update the readme to reflect this.

  While we are at it mention the fact that the cookbook depends on a specific version of `rust-bitcoin` and that this may not be the latest available version. Link to both.

ACKs for top commit:
  apoelstra:
    Looks good. utACK ce16b46

Tree-SHA512: f4370ba9d1ac09ebdf929bb4dcd45234c2e835443e22fa1348c6ed6cdbba071a7b8573b75aa63715e66c5245e64c74a55be58d0ae06ad57de9a531691047bae9

Author: tcharding

README.md

@@ -1,13 +1,17 @@
 # Website source for `www.rust-bitcoin.org`
 
-While the website is deployed at rust-bitcoin.org there are still missing parts such as the cookbook.
-We will be happy to receive contributions adding interesting examples.
-
 Website for the rust-bitcoin ecosystem. The site is built using [hugo](https://gohugo.io/) and the
 [nightfall](https://themes.gohugo.io/themes/hugo-theme-nightfall/) theme.
 
 Includes a cookbook built with [mdbook](https://rust-lang.github.io/mdBook/).
 
+Contributions most welcome and appreciated. If you come here looking for how to do something and
+find it missing please consider contributing an example or raising an issue.
+
+## Current rust-bitcoin version
+
+This cookbook is currently based on [rust-bitcoin `v0.31.1`](https://docs.rs/bitcoin/0.31.1/bitcoin/index.html)
+
 ## License
 
 This website is licensed under [CC0 1.0 Universal (CC0 1.0) Public Domain Dedication][cc].

cookbook/README.md

@@ -5,7 +5,9 @@
 Welcome to the `rust-bitcoin` cookbook!
 This cookbook is designed to provide readers with a
 comprehensive understanding of `rust-bitcoin` and its key features.
-Don't forget to check [`rust-bitcoin`'s documentation](https://docs.rs/bitcoin)
+
+Cookbook currently depends on `rust-bitcoin` version [`v0.31.1`](https://docs.rs/bitcoin/0.31.1/bitcoin/index.html).
+This may not be the [latest available version](https://docs.rs/bitcoin) of `rust-bitcoin`.
 
 ## How to contribute