Docs: set the right repository on pub.dev

[danielgomezrico]

Is your feature request related to a problem? Please describe. Currently this link sents you to the original hive repository and not this one

Describe the solution you'd like It should open your repository: https://github.com/martipello/hive_built_value

It is pretty hard to find the code of the plugin

[martipello]

this is correct, it will be addressed if we ever manage to make a new release updating the analyzer and other packages