Regex-Pattern for type Etherpad::Ensure

[hihiuztrewq]

Hello,

I stumbled apon a bug in this module:
Setting a fixed version vor etherpad fails, because the regex doesn't allow the current version.
'1.8.8' is a valid version string, but the current version '1.8.18' is not valid for the regex.

This could be fixed by adding + after the last \d: \A\d\.\d\.\d+\Z in types/ensure.pp