Drop IE11 Support (#476)

src/Explorer/Graph/GraphExplorerComponent/GremlinSimpleClient.ts

@@ -4,11 +4,8 @@
  * - inspired from gremlin-javascript for nodejs: https://github.com/jbmusso/gremlin-javascript
  * - tested on cosmosdb gremlin server
  * - only supports sessionless gremlin requests
- * - Relies on text-encoding polyfill (github.com/inexorabletash/text-encoding) for TextEncoder/TextDecoder on IE, Edge.
  */
 
-import { TextEncoder, TextDecoder } from "text-encoding";
-
 export interface GremlinSimpleClientParameters {
   endpoint: string; // The websocket endpoint
   user: string;