v2.1.0

• Adds visibleOnLoad prop that works with the default LogMonitor. You can now write <DevTools store={store} monitor={LogMonitor} visibleOnLoad={false} /> to prevent the monitor from appearing at the page load. It's still available when you press Ctrl+H!
• Adds deserializer parameter to persistState(). See #78 (comment) for a usage example with Immutable.