This app is incompatible with the new Xero pricing plans #43
Description
When I run the code in this repo I get the following error:
ValueError: Invalid value for `_class` (COMPREHENSIVE), must be one of ['DEMO', 'TRIAL', 'STARTER', 'STANDARD', 'PREMIUM', 'PREMIUM_20', 'PREMIUM_50', 'PREMIUM_100', 'LEDGER', 'GST_CASHBOOK', 'NON_GST_CASHBOOK', 'ULTIMATE', 'LITE', 'None']
It's because the SDK version in requirements.txt is 1.5.3 and this was a breaking change in API version 4.0.