## Improve `NotAuthorizedError` message to include policy class (#812)

Default error message changed from:
> not allowed to destroy? this Comment

To include the policy class:
> not allowed to Project::Admin::CommentPolicy#destroy? this Comment

## Improve `NotAuthorizedError` when record is a class

Before:
> not allowed to index? this Class

After:
> not allowed to PostPolicy#index? Post

## Allow customizing rspec matcher description (#806)

Before:
> PostPolicy
>  update? and show?
>    is expected to permit #<User:0x0000000104aefd80> and #<Post:0x0000000104aef8d0 @user=#<User:0x0000000104aefd80>>

In `spec_helper.rb`:
```ruby
Pundit::RSpec::Matchers.description = ->(user, record) do
  "permit user with role #{user.role} to access record with ID #{record.id}"
end
```

After:
> PostPolicy
>  update? and show?
>    is expected to permit user with role admin to access record with ID 130

## Add support for filter_run_when_matching :focus with permissions helper (#820)

If your RSpec config has filter_run_when_matching :focus, you may tag the permissions helper like so:

```ruby
permissions :show?, :focus do
```