Fix nodeConfig.json

The comma just after "maxSession: 10" is the root cause of the following issue 
Error with the JSON of the config : Wrong format for the JSON input : com.google.gson.stream.MalformedJsonException: Expected name at line 1 column 458 path $.configuration.maxSession
Merge pull request #1 from ChristopheOGER/patch-1

Fix nodeConfig.json