README: remove items from TODO that are done
README: remove items from TODO that are done

We have a crates.io fetcher and the ability to build without network.

meta-rust/meta-rust,meta-rust/meta-rust,jmesmon/meta-rust,meta-rust/meta-rust,cardoe/meta-rust,meta-rust/meta-rust,cardoe/meta-rust,jmesmon/meta-rust,meta-rust/meta-rust,jmesmon/meta-rust,cardoe/meta-rust,starlab-io/meta-rust,jmesmon/meta-rust,cardoe/meta-rust,starlab-io/meta-rust