v2.0.0

• feature: example html - added CSS animation for showing main thread status
• feature: example html - added version switch
• feature: support AbortController (abort / cancel during compression) #101
• feature: options.alwaysKeepResolution (default: false) - keep the resolution (width and height) during compression and reduce the quality only (note that options.maxWidthOrHeight is still applied if set) #127
• fixed: Main thread is blocked on Mac device for options.useWebWorker=true #139
• updated: dropped core-js to reduce bundle size #138
• updated: options.useWebWorker default set to true