Updated taskflow now that 0.3.x is released

The taskflow team had a new release, so we need to readjust
the version bounds to reflect the new version and the unreleased
0.4 version (which is now the development version).

Change-Id: Iae6206b70a327fa272de7b75190481fc3352779e
Merge "Updated taskflow now that 0.3.x is released"