v2.2.0

• Upgrade solidity version up to 0.8.21
• Open Zeppelin dependencies upgrade to 4.9.3
• EnvelopV1 dependencies upgrade to 1.3.0

v2.1.0

On-Off switch ability in service provider contract

v2.0.0

Added

• Upgrade solidity version up to 0.8.19
• Open Zeppelin dependencies upgrade to 4.8.3
• EnvelopV1 dependencies upgrade to 1.2.0
• ServiceProviderOwnable for implements Ownable pattern for service providers
  see mocks as example.

Fixed

• Version numeration changed

Minor BugFixes

Remove unesed code from Service Provider

Update Examples and settings

BUGFIX in examples;
Update brownie settings file, README

0.0.1

The subscription platform operates with the following role model (it is assumed that the actor with the role is implemented as a contract).
Service Provider is a contract whose services are sold by subscription.
Agent - a contract that sells a subscription on behalf ofservice provider. May receive sales commission
Platform - SubscriptionRegistry contract that performs processingsubscriptions, fares, tickets