edit customer update fields
Add PRs for python migration
Fix missing parameters for card_hold_create and customer_update
Fix spelling mistakes
Edit PR for migration example
Use newly rendered balanced.rev1.json from api-spec
Edit read me to explain adding fields to scenarios
Edit rev1_api_spec.py to parse new balanced.rev1.json
Refractor to seperate methods
Refractor to make inline methods class methods
Merge pull request #452 from balanced/doc_fixes

Doc fixes