Hide .tar files too.
Make version numbers match /\d+\.\d{3}(_\d{3})?/

Which also makes all three modules use the same format.

Doing dev releases with /\d+\.\d{2}/ as the base version
always confused me.
Release v3.001 - Zlib support, better magic header, etc

* Add Zlib compression support to the protocol
* Add Zlib support to Encoder/Decoder
* Add CANONICAL_UNDEF tag to represent PL_sv_undef
* Change magic header so it is trivial to detect
  and reject utf8 encoded Sereal packets.
* Minor changes to how scalar values are serialized
  to favour more compact representations.