v1.3.0

• Added email validation feature, disabled by default. It can be enabled at configuration.
• Requires new version of Harmony JS client (2.2.0)
• Potentially breaking change on configuration JSON format
  • we use JavaScript JSON.parse() to deserialize configuration now, so it will require strict JSON format
  • attribute keys should be properly double quoted ("), e.g. { "key": "value" }