Merge pull request 'add app version seed.' (#9) from dev into master

Reviewed-on: #9

api/bin/migrate.dart

@@ -34,6 +34,7 @@ void main(List<String> args) async {
     DownloadHistoryMigration(),
     LikeRecordMigration(),
     AppVersionMigration(),
+    AppVersionSeed(),
   ]);
   await runMigrations(migrationRunner, args);
 }

api/lib/apis.dart

@@ -1,7 +1,7 @@
 class Apis {
   static const apiScheme = 'http';
-  static const apiHost = '127.0.0.1';
+  static const apiHost = 'home.debuggerx.com';
-  static const apiPort = 3000;
+  static const apiPort = 30000;
 
   static const appNewVersionUrl = 'https://www.debuggerx.com';