Release v1.0.3

This release adds the "-C/--cleanup" flag to clean up the mock chroots
after a build. It also ensures that mock will build unique chroots for
each build, useful for automation environments where autospec is run in
parallel.

Release v1.0.2

Allow users to specify requires that are not dropped during existence
detection and os-packages list checking.

Release v1.0.1

Officially release all changes since 1.0.0 to begin regular release
cadence.