fix: bump cargo-generate version to 0.18.2 (#1245)

[sassman]

Make sure these boxes are checked! 📦✅

• You have the latest version of rustfmt installed

$ rustup component add rustfmt

• You ran cargo fmt on the code base before submitting
• You reference which issue is being closed in the PR text see Fails with latest cargo-generate #1245

✨✨ 😄 Thanks so much for contributing to wasm-pack! 😄 ✨✨

[drager]

Thanks!