Merge pull request #180 from leezak5555/patch-2

Unity Code stripping fix

Author: endel

src/codegen/languages/csharp.ts

@@ -60,8 +60,15 @@ function generateClass(klass: Class, namespace: string) {
 
 using Colyseus.Schema;
 using Action = System.Action;
+#if UNITY_5_3_OR_NEWER
+using UnityEngine.Scripting;
+#endif
 ${namespace ? `\nnamespace ${namespace} {` : ""}
 ${indent}public partial class ${klass.name} : ${klass.extends} {
+#if UNITY_5_3_OR_NEWER
+[Preserve] 
+#endif
+public ${klass.name}() { }
 ${klass.properties.map((prop) => generateProperty(prop, indent)).join("\n\n")}
 
 ${indent}\t/*