CTR add back the accidentally removed @ts-ignore for linter

Author: xiazcy

gremlin-javascript/src/main/javascript/gremlin-javascript/lib/structure/io/graph-serializer.ts

@@ -274,6 +274,7 @@ export class GraphSON2Reader {
     const keys = Object.keys(obj);
     const result = {};
     for (let i = 0; i < keys.length; i++) {
+      // @ts-ignore
       result[keys[i]] = this.read(obj[keys[i]]);
     }
     return result;