Release Amalgamate version 0.1.33.
Release Amalgamate version 0.1.33.

 * Remove dead code.
 * User specified `group` function to `map`. Closes #184.
 * Upgrade `skip` to `0.2.6`. Closes #183.
 * Upgrade `skip` to `0.2.5`. Closes #182.

Closes #185.

bigeasy/amalgamate,bigeasy/amalgamate