how do I get the version of the pigeonhole-sieve plugin

[Heiko Schlittermann]

Hello,

as may parts of the dovecot configuration docs refer to sieve and it's
specific versions, like 

    NOTE: Pigeonhole versions before v0.3.1 do not support the lo

… how do I get the Pigeonhole version my local dovecot uses?
The package version number of the ubuntu package dovecot-sieve isn't telling me
anything here, because it's bound to the dovecot version number.

What do I miss here?

Thank you.

    Best regards from Dresden/Germany
    Viele Grüße aus Dresden
    Heiko Schlittermann
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