Use nanoid

lib/index.js

@@ -21,6 +21,11 @@ if (!Pushy) {
   throw new Error('react-native-update模块无法加载，请对照安装文档检查配置。');
 }
 
+// TODO: save and export current version info
+// name
+// description
+// metaInfo
+
 export const downloadRootDir = Pushy.downloadRootDir;
 export const packageVersion = Pushy.packageVersion;
 export const currentVersion = Pushy.currentVersion;
@@ -39,7 +44,7 @@ if (Platform.OS === 'android' && !Pushy.isUsingBundleUrl) {
 const eventEmitter = new NativeEventEmitter(Pushy);
 
 if (!uuid) {
-  uuid = require('uuid/v4')();
+  uuid = require('nanoid/non-secure')();
   Pushy.setUuid(uuid);
 }