fix: prepare script

Author: mrkpatchaa

package.json

@@ -1,10 +1,10 @@
 {
   "name": "@mrkpatchaa/react-native-ionicons",
-  "version": "1.2.0",
+  "version": "1.2.1",
   "description": "",
   "main": "src/index.js",
   "scripts": {
-    "prepublish": "npm run gen:icons",
+    "prepare": "npm run gen:icons",
     "gen:icons": "./src/generate_icons.sh node_modules/ionicons/dist/svg",
     "test": "echo \"Error: no test specified\" && exit 1"
   },