v0.26.0 - Observable and PubSub stores

What's Changed

• Data stores by @khushmmehta in #82

This update introduces Observable and PubSub stores to Astra. You can use these amazing utilities to introduce reactivity to your software with ease!

Bug Fixes

• delegate subcounter and enforce type preference - (6b98b67)

Documentation

• data stores - (a9f36c7)
• finished data-stores docs - (d9c57a2)

Features

• implement observer pattern - (14141a4)

Miscellaneous Chores

• prefer function type for publish - (ad6e812)

Performance

• hashed tables for observee-subscriber sets #26 - (3a7ae14)
• use a hash table to store subscribers - (75f10be)

Full Changelog: v0.25.1...v0.26.0