Creating new Sites on Multisite failes when using Epoch

Hi,

when using Epoch, creating new Sites on a Multisite Network fails with

`Warning: call_user_func_array() expects parameter 1 to be a valid callback, class 'postmatic\epoch\core' does not have a method 'activate_new_site' in /Users/carstenwawer/Sites/[...]/wp-includes/plugin.php on line 524`

Any idea what i can do about it?

Thanks in Advance!
