v0.4.0

Added

• Display arrow when hover on top level submenu title
• Add toggle option for sidebar and break points
• Add popperArrow prop in Menu component to specify whether to display an arrow to point to sub-menu wrapper on sidebar collapsed

Changed

• Use direction:rtl instead of row-reverse

Fixed

• Fix react-slidedown css import issue #1 from @metadan
• Fix submenu positioning on sidebar collapsed using popperjs and resize-observer-polyfill for resize event listener.