• BREAKING: Apify.utils.requestAsBrowser() no longer aborts request on status code 406
  or when other than text/html type is received. Use options.abortFunction if you want to
  retain this functionality.
• BREAKING: Added useInsecureHttpParser option to Apify.utils.requestAsBrowser() which
  is true by default and forces the function to use a HTTP parser that is less strict than
  default Node 12 parser, but also less secure. It is needed to be able to bypass certain
  anti-scraping walls and fetch websites that do not comply with HTTP spec.
• BREAKING: RequestList now removes all the elements from the sources array on
  initialization. If you need to use the sources somewhere else, make a copy. This change
  was added as one of several measures to improve memory management of RequestList
  in scenarios with very large amount of Request instances.
• DEPRECATED: RequestListOptions.persistSourcesKey is now deprecated. Please use
  RequestListOptions.persistRequestsKey.
• RequestListOptions.sources can now be an array of string URLs as well.
• Added sourcesFunction to RequestListOptions. It enables dynamic fetching of sources
  and will only be called if persisted Requests were not retrieved from key-value store.
  Use it to reduce memory spikes and also to make sure that your sources are not re-created
  on actor restarts.
• Updated stealth hiding of webdriver to avoid recent detections.
• Apify.utils.log now points to an updated logger instance which prints colored logs (in TTY)
  and supports overriding with custom loggers.
• Improved Apify.launchPuppeteer() code to prevent triggering bugs in Puppeteer by passing
  more than required options to puppeteer.launch().
• Documented BasicCrawler.autoscaledPool property, and added CheerioCrawler.autoscaledPool
  and PuppeteerCrawler.autoscaledPool properties.
• SessionPool now persists state on teardown. Before, it only persisted state every minute.
  This ensures that after a crawler finishes, the state is correctly persisted.
• Added TypeScript typings and typedef documentation for all entities used throughout SDK.
• Upgraded proxy-chain NPM package from 0.2.7 to 0.4.1 and many other dependencies
• Removed all usage of the now deprecated request package.