Static attributes will be removed in FactoryBot 5.0 - updating readme
Static attributes will be removed in FactoryBot 5.0 - updating readme

FactoryBot threw a deprecation warning when I copied the example from the
readme:

```
  DEPRECATION WARNING: Static attributes will be removed in FactoryBot 5.0. Please use dynamic
  attributes instead by wrapping the attribute value in a block:

  to { [{:full=>"to_user@email.com", :email=>"to_user@email.com", :token=>"to_user", :host=>"email.com", :name=>nil}] }
```

This updated the readme to use dynamic attributes.

thoughtbot/griddler,thoughtbot/griddler,thoughtbot/griddler