2.0.0-beta2

• CorePayments
  • Fix issue that causes analytics version number to always be null
• Breaking Changes
  • CardPayments
    • Remove CardClient.approveOrderListener property
    • Remove CardClient.cardVaultListener property
    • Remove ApproveOrderListener type
    • Add CardApproveOrderCallback interface
    • Convert CardApproveOrderResult to a sealed class
    • Remove CardClient.approveOrder(CardRequest) method
    • Add CardClient.approveOrder(CardRequest, CardApproveOrderCallback) method
    • Add CardClient.finishApproveOrder(Intent, String) method
    • Add CardFinishApproveOrderResult type
    • Remove CardResult type
    • Remove CardClient.vault(Context, CardVaultRequest) method
    • Remove CardClient.completeAuthChallenge(Intent, String) method
    • Remove CardClient.removeObservers() method
    • Add CardClient.vault(CardVaultRequest, CardVaultCallback) method
    • Add CardClient.finishVault(Intent, String) method
    • Add CardFinishVaultResult type
    • Add CardVaultCallback interface
    • Convert CardVaultResult to a sealed class
  • PayPalWebPayments
    • Remove PayPalWebCheckoutClient.listener property
    • Add PayPalWebCheckoutClient.finishStart(Intent, String) method
    • Remove PayPalWebCheckoutResult type
    • Add PayPalWebCheckoutFinishStartResult type
    • Remove PayPalWebCheckoutClient.vaultListener type
    • Add PayPalWebCheckoutClient.finishVault(Intent, String) method
    • Remove PayPalWebCheckoutClient.removeObservers() method
    • Add PayPalWebCheckoutFinishVaulResult type
    • Remove PayPalWebVaultResult type