add changelog and readme for initial eventdata (#159)

Author: hartzis

CHANGELOG.md

@@ -1,3 +1,6 @@
+# 5.4.0
+* Add `initial` property to `eventData` that supplies the inital `[x, y]` swipe value coordinates [issue #150](https://github.com/dogfessional/react-swipeable/issues/150) and [PR #131](https://github.com/dogfessional/react-swipeable/pull/151)
+
 # 5.3.0
 * Optimization for `useSwipeable` hook. Added `useMemo` for handler internals [issue #134](https://github.com/dogfessional/react-swipeable/issues/134) and [PR #149](https://github.com/dogfessional/react-swipeable/pull/149)
   * Thank you [@FaberVitale](https://github.com/FaberVitale)!

README.md

@@ -51,6 +51,7 @@ All Event Handlers are called with the below event data.
 ```
 {
   event,          // source event
+  inital,         // initial swipe [x,y]
   deltaX,         // x offset (initial.x - current.x)
   deltaY,         // y offset (initial.y - current.y)
   absX,           // absolute deltaX

package.json

@@ -1,7 +1,7 @@
 {
   "name": "react-swipeable",
   "version": "5.3.0",
-  "description": "Swipe event handler & hook for react",
+  "description": "React Swipe event handler component & hook",
   "main": "./lib/index.js",
   "module": "es/index.js",
   "scripts": {