v4.0.0

🎉 Big 2020 release 🎉

• React 16.3.0 or newer is now required
• Refactored to TypeScript, type definitions are now included
• Added: FacebookMessengerShareButton and FacebookMessengerShareCount
• Added: WeiboIcon
• Fixed: VKShareButton
• Fixed: LinkedinShareButton
• Fixed: MailruShareButton
• Fixed: TumblrShareCount
• Fixed: FacebookShareCount
• Breaking changes:
  • default classNames have been changed
  • all { ...rest } props are spread to the root element for share buttons and share counts
  • share counts are now rendered in span element instead of div
  • icons have svg as root element instead of div
  • icon props were renamed: iconBgStyle -> bgStyle, logoFillColor -> iconFillColor