#56 : Rename focusable -> hoverable

src/actions/hoverable/event.js

@@ -0,0 +1,15 @@
+// in event
+export function addHoverInEventListener(source, cb) {
+  source.addEventListener('mouseenter', cb)
+}
+export function removeHoverInEventListener(source, cb) {
+  source.removeEventListener('mouseenter', cb)
+}
+
+// out event
+export function addHoverOutEventListener(source, cb) {
+  source.addEventListener('mouseleave', cb)
+}
+export function removeHoverOutEventListener(source, cb) {
+  source.removeEventListener('mouseleave', cb)
+}