Aleph-message

What's Changed
* [Chains] Add support for Tezos by odesenfans in https://github.com/aleph-im/aleph-message/pull/12
* Cleanup: Refactoring, updates and new utils by hoh in https://github.com/aleph-im/aleph-message/pull/14
* Hoh fix serialization by hoh in https://github.com/aleph-im/aleph-message/pull/16
* Feature: Add support for durable VMs by hoh in https://github.com/aleph-im/aleph-message/pull/15

**Full Changelog**: https://github.com/aleph-im/aleph-message/compare/0.1.19...0.2.0

What's Changed
* Feature: support forgetting aggregates by odesenfans in https://github.com/aleph-im/aleph-message/pull/9
This adds the support for forgetting aggregates via FORGET messages.

* Feature: Deduce ItemType from hash format by hoh in https://github.com/aleph-im/aleph-message/pull/8
Use `ItemType.from_hash(hash_str)` to deduce the type of storage (`IPFS` or database `storage`)

* Fix: Field `forgotten_by` was not supported by the Message models. by hoh in https://github.com/aleph-im/aleph-message/pull/10
Message validation now accepts this field.

* New Metadata added. by leirbag95 in https://github.com/aleph-im/aleph-message/pull/5
Program developers can add custom metadata such as a name or version number to their programs.

Internal changes
* Fix: URL query field `chain` is not supported by PyAleph by hoh in https://github.com/aleph-im/aleph-message/pull/7

New Contributors
* odesenfans made their first contribution in https://github.com/aleph-im/aleph-message/pull/9
* leirbag95 made their first contribution in https://github.com/aleph-im/aleph-message/pull/5

**Full Changelog**: https://github.com/aleph-im/aleph-message/compare/0.1.18...0.1.19

Adds the support for tge new type of messages `FORGET`.

This release adds the PROGRAM message specification, that specifies how to write programs to run on Aleph.im Virtual Machines.

See https://github.com/aleph-im/aleph-message/pull/2 for the implementation of the specification.