v2.6.9

• Added feature test of Worker constructor and automatic fallback on the main thread if not present, i.e. you don't need to set userWebWorkers to false anymore.
• Added simple test suite for Node.js, see https://github.com/gildas-lormeau/zip.js/blob/master/tests/node-runner.js (tested on v18.4.0)
• Made crypto API optional when using ZipCrypto to decrypt files (fix)