Updating HOC to return PureComponent instead of Component for performance boost.

Incrementing minor version.

Author: billmalarky

lib/imageCacheHoc.js

@@ -32,7 +32,7 @@ export default function imageCacheHoc(Image, options = {}) {
   if (options.fileDirName && typeof options.fileDirName !== 'string') { throw new Error('fileDirName option must be string'); }
   if (options.defaultPlaceholder && (!options.defaultPlaceholder.component || !options.defaultPlaceholder.props)) { throw new Error('defaultPlaceholder option object must include "component" and "props" properties (props can be an empty object)'); }
 
-  return class extends React.Component {
+  return class extends React.PureComponent {
 
     static propTypes = {
       fileHostWhitelist: PropTypes.array,

package.json

@@ -1,6 +1,6 @@
 {
   "name": "react-native-image-cache-hoc",
-  "version": "1.3.1",
+  "version": "1.4.0",
   "description": "React Native Higher Order Component that adds advanced caching functionality to the react native Image component.",
   "main": "index.js",
   "scripts": {