Update PluginManifest.cs to version 1.3.4

Author: K4ryuu

src-plugin/Plugin/PluginManifest.cs

@@ -10,7 +10,7 @@ public sealed partial class Plugin : BasePlugin
 
         public override string ModuleAuthor => "K4ryuu";
 
-        public override string ModuleVersion => "1.3.3 " +
+        public override string ModuleVersion => "1.3.4 " +
 #if RELEASE
             "(release)";
 #else