bump version to 0.4.0

The `replicate` package on PyPI used to be a different project (keepsake) with several releases. This big version bump skips over those old releases. After this we can start following Semantic Versioning

Signed-off-by: Zeke Sikelianos <[email protected]>

0.0.1a16

Signed-off-by: Ben Firshman <[email protected]>

bump version to 0.0.1a10

Signed-off-by: Zeke Sikelianos <[email protected]>

0.0.1a8

Signed-off-by: Ben Firshman <[email protected]>