Filtering on the subhash directly.

Fixes:

```
Deprecation Warnings:

Filtering by an `:example_group` subhash is deprecated. Use the subhash to filter directly instead. Called from reeder/spec/spec_helper.rb:92:in `block in <top (required)>'.


If you need more of the backtrace for any of these deprecations to
identify where to make the necessary changes, you can configure
`config.raise_errors_for_deprecations!`, and it will turn the
deprecation warnings into errors, giving you the full backtrace.
```