package.json bug fix

package.json

@@ -6,7 +6,7 @@
   "scripts": {
     "test": "node ./scripts/test.js",
     "prepare": "",
-    "postversion": "node ./scripts/postversion.js"
+    "version": "node ./scripts/update_version.js; git add purlfy.js"
   },
   "repository": {
     "type": "git",

scripts/update_version.js

@@ -0,0 +1,14 @@
+// Modify the version number at `purlfy.js` file:
+// `return "0.3.5";`
+// to the new version number.
+// And then `git add purlfy.js`.
+
+const fs = require('fs');
+const package = require('../package.json');
+const purlfyPath = "./purlfy.js";
+
+const version = package.version;
+const data = fs.readFileSync(purlfyPath, 'utf8');
+const result = data.replace(/return "\d+\.\d+\.\d+";/, `return "${version}";`);
+fs.writeFileSync(purlfyPath, result, 'utf8');
+console.log(`Updated version to ${version}`);