Aws-lambda-event

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**Bugfixes**

- add ``version`` field to ``CloudWatchScheduledEvent`` event object.

**Miscellaneous**

- update README

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**Breaking Changes**

- use ``dataclasses`` everywhere. The original initialization method ``Event(data: dict)`` no longer work. Now it use ``Event.from_dict(data: dict)`` for initialization.

**Features and Improvements**

- add ``CloudWatchLogsEvent`` event object.
- add ``CloudWatchScheduledEvent`` event object.

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**Features and Improvements**

- add ``S3PutEvent`` event object.
- add ``S3DeleteEvent`` event object.
- add ``SNSTopicNotificationEvent`` event object.
- add ``SQSEvent`` event object.
- add ``DynamodbUpdateEvent`` event object.
- add ``KinesisStreamEvent`` event object.
- add ``KinesisFirehoseEvent`` event object.

**Miscellaneous**

- ``aws_lambda_event`` library 1.X.X aim to zero dependencies.