chore: Release zeromq version 0.6.0

chore: Release zeromq version 0.6.0-pre.1

Merge pull request #225 from zeromq/rgbkrk/bump-pre3

prepare 0.5.0-pre.3 release

Merge pull request #222 from zeromq/version/0.5.0-pre.2

Bump version to 0.5.0-pre.2

chore: Release zeromq version 0.5.0-pre

0.4.1

0.4.0

0.3.5