only modify changelog on release

Author: CoderDake

tool/update_version.dart

@@ -401,18 +401,18 @@ class AutoUpdateCommand extends Command {
     final type = argResults!['type'].toString();
     final isDryRun = argResults!['dry-run'];
     final currentVersion = versionFromPubspecFile();
-    bool modifyChangeLog = true;
+    bool modifyChangeLog = false;
     String? newVersion;
     if (currentVersion == null) {
       throw 'Could not automatically determine current version.';
     }
     switch (type) {
       case 'release':
         newVersion = stripPreReleases(currentVersion);
+        modifyChangeLog = true;
         break;
       case 'dev':
         newVersion = incrementDevVersion(currentVersion);
-        modifyChangeLog = false;
         break;
       default:
         newVersion = incrementVersionByType(currentVersion, type);