Email subscription 3.4

Email subscription v3.4 changes:

Compatible XF 2.3.

Email subscription v3.3 changes:

Security update. The emoji field in the options page has been removed, you can add a emoji to the emailsubscription_subject phrase.

Email subscription v3.2 changes:

Now compatible with PHP 7.4.

Email subscription v3.1 changes:

Fixed variables relating to issues with PHP 7.4.

Email subscription v3.0 changes:

Now compatible with PHP 7.4.

Email subscription v2.9 changes:

Now using finder for performing database queries.

Email subscription v2.8 changes:

Updated setup to use schema manager.

Email subscription v2.7 changes:

Added option to add an emoji to the subject line of the email.

Email subscription v2.6 changes:

Fixed a problem with the import function.

Email subscription v2.5 changes:

Added "Count" to Email subscription admin page.