update --select dbt version error message

[leoebfolsom]

I thought the error message, while really good already, could use some extra love.

Specifically, I wasn't sure exactly what the next step was, even though the message made it very clear what the problem and the solution was (but not the tactical steps to solve the problem).

Here's what the new error message looks like:

The `--select` feature requires dbt >= 1.5, but your project's manifest.json is from dbt v.1.4.
Please follow these steps to use the `--select` feature: 

 1. Update your dbt-core version via pip install 'dbt-core>=1.5'. Details: https://docs.getdbt.com/docs/core/pip-install#change-dbt-core-versions
 2. Execute any `dbt` command (`run`, `compile`, `build`) to create a new manifest.json.