Postallow 3.5.0

This is an updated version of @stevejenkins' postwhite.

This release has the following changes:

• Change whitelist c.s. to allowlist c.s.
• Change blacklist c.s. to blocklist c.s.
• Updated the list of hosts that will be checked
• Updated the link to scrape IP addresses for Yahoo! Mail

Full Changelog: https://github.com/lquidfire/postallow/commits/3.5.0