Less confusing path output for new

[michaelkirk]

Before:
[INFO]: 🐑 Generated new project at /my-package
After:
[INFO]: 🐑 Generated new project at ./my-package

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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
• [n/a] You reference which issue is being closed in the PR text
  (seemed self explanatory, not worth creating an issue)

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