Santiagoebizmarts

Add option to delete Mailchimp for Magento 1 stores in the grid. This will allow people to maintain the M1 store until the M2 stores is fully synced.

Add a way to allow subscribers to give consent over the list [marketing permissions](https://mailchimp.com/help/collect-consent-with-gdpr-forms/).

**Describe the bug** composer.json not allowing installation on Magento 2.1.9 **To Reproduce** Steps to reproduce the behavior: 1. Run install command: composer require ebizmarts/magento2-mandrill 3.0.14 **Expected behavior** Installation runs successfully....