Merge pull request #353 from rustwasm/rustc-version-check

feat(build): add rustc check

Author: ashleygwilliams

Cargo.lock

@@ -24,6 +24,8 @@ visiting that repo!
 
 ## 🔮 Prerequisities
 
+This project requires Rust 1.30.0 or later.
+
 - [Development Environment](https://rustwasm.github.io/wasm-pack/book/prerequisites/index.html)
 - [Installation](https://rustwasm.github.io/wasm-pack/installer)
 - [Project Setup](https://rustwasm.github.io/wasm-pack/book/project-setup/index.html)