Fixed "invalid date" bug with subscription events

• Fix a bug with SubscriptionEvent where event_date and effective_date would return Not a valid date error message
• Remove some test files
• Update some links to the relevant documentation

Fix missing uuid in Contacts

• Fix missing uuid in Contacts

Support for Contacts

• Added support for Contacts (https://dev.chartmogul.com/reference/contacts)
• Also added aliases in Customers related to Contacts

Support marshmallow 3

• Upgrade the Marshmallow dependency to be >=3.10.0 (#38) #39

Fix issues with dependencies

• Drops support of Python 3.4
• Fix issues with dependencies (#32)

Support subscription_set_external_id

• This is the last version supporting Python 3.4
• Update client get endpoints for MCS [chch16182] (#31)

v1.2.4

Commits

• [de4e0a2] - Allow customer_external_id param in invoice#create action (#30) (Hassansin)

Fix Marshmallow dependency

v1.2.3

Use twine for distribution uploading

Connect Subscriptions

Features

• [ee21db8] - Added method for Connect subscriptions [ch4617] (#23) (Hassansin)

Rate limiting

• Add support for rate limiting (#21)