bump completion aggregator version to 1.5.25 (#1685)
bump completion aggregator version to 1.5.25 (#1685)

* bump completion aggregator version to 1.5.24

* bump completion aggregator version to 1.5.25

edx-solutions/edx-platform,edx-solutions/edx-platform,edx-solutions/edx-platform,edx-solutions/edx-platform