v3.0.0

This release modernizes restructure to drop Node-specific dependencies so it can more easily be used in the browser. With these changes, restructure now has zero dependencies.

• Add ESM support.
• Input and output is now Uint8Array rather than Buffer
• Encoding drops the streaming API in favor of a toBuffer method.
• fromBuffer is also added as a shortcut.
• Legacy text encodings are now supported via TextDecoder, a native browser API also implemented in Node, rather than iconv-lite. This means only decoding is supported, not encoding, as TextEncoder does not support legacy encodings.
• Drop Node 12 support. Raise baseline to 14 (current LTS).