Add disconnect method (#899)

package.json

@@ -1,6 +1,6 @@
 {
   "name": "fluence",
-  "version": "0.5.2",
+  "version": "0.5.3",
   "description": "the browser js-libp2p client for the Fluence network",
   "main": "./dist/fluence.js",
   "typings": "./dist/fluence.d.ts",

src/fluence_client.ts

@@ -224,6 +224,10 @@ export class FluenceClient {
         }
     }
 
+    async disconnect(): Promise<void> {
+        return this.connection.disconnect();
+    }
+
     /**
      * Establish a connection to the node. If the connection is already established, disconnect and reregister all services in a new connection.
      *