Action Network's search_by value now must be email_address for emails.

[fishinthecalculator]

Description

Action Network's search_by value now must be email_address for emails.

Motivation and Context

Fixes #16

How Has This Been Tested?

I have been using this for weeks.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read and agreed to the PhillyDSA Tech Team Code of Conduct