@blueprintjs/core@3.0.0-beta.1

• 📦 move react-transition-group from peer to standard dependency #2511
• 📦 new 3.0 upgrade script, improve 2.0 upgrade script #2488
• new icons: crown and tree-diagram #2507
• fix typings of HTML Table component #2509
• fix upgrade script's treatment of removed props #2486
• Button fix button width with large CSS icon only #2497
• Tabs fix vertical style #2495
• Tag improve outline behavior #2428
• Spinner adjust stroke width #2491
• Switch fix align-right style #2494
• Toaster.create() throws error if used within lifecycle method #2522
• ensureElement utility supports React.Fragment #2499