#### v2.3.1
*  Add billing preview capability
*  Capitalize first letter of wsdl object name to ensure that it is a valid Ruby constant
#### v2.3.0
#### v2.2.7
#### v2.2.6
#### v2.2.5
#### v2.2.4
#### v2.2.3
#### v2.2.5
#### v2.2.4
#### v2.2.2
* Fix #43 - Add invoice_payment_data to exclusions list

  > David: : https://github.com/sportngin/active_zuora/pull/44
#### v2.2.0
#### v2.1.4
#### v2.1.3
#### v2.1.2
#### v2.1.1
#### v2.1.0
* Upgrade Savon to 1.2 https://github.com/sportngin/active_zuora/pull/22
  - By @nvd
  - Makes AZ 2 Thread Safe
#### v2.0.6
#### v2.0.5