fix date format

Author: RomanBachaloSigmaSoftware

lib/eSignature/examples/listEnvelopes.js

@@ -32,7 +32,7 @@ const listEnvelope = async (args) => {
   // a set of envelopeIds. Here we filter using a from_date.
   // Here we set the from_date to filter envelopes for the last month
   // Use ISO 8601 date format
-  let options = { fromDate: moment().subtract(30, 'days').format() };
+  let options = { fromDate: moment().subtract(30, 'days').format('YYYY-MM-DD') };
 
   // Exceptions will be caught by the calling function
   //ds-snippet-start:eSign3Step2