docs(): add CHANGELOG.md to projects and update release

[billyjov]

npm shows that the current version 2.1.5 is but the github releases only shows v2.1.2

[wittlock]

I've remedied the github releases, but still need to add a changelog. So far most of my contributions are just for angular updates, but I have some bigger things planned that would warrant a changelog from that point onward. Thanks for pointing it out. I'll keep this issue open as a reminder to write a changelog.

[sgriffault]

Up !
On NPM, the latest version is now 13.3 and only 2.3 on Github

[Coffee-Tea]

@sgriffault Sorry there are no big contributors here, and we are doing only hotfixes or angular versions support.
If you would like you could add PR for changelog :) It will be much appreciated.

[Coffee-Tea]

Up ! On NPM, the latest version is now 13.3 and only 2.3 on Github

Added the latest release on Github.