Update README.md

Author: davras5

workers/README.md

@@ -5,7 +5,7 @@ Overview of all workers in the OpenBuildings pipeline.
 | Worker | Description | Status | Implementation | Data Sources |
 |--------|-------------|--------|----------------|--------------|
 | [base-worker](base-worker/) | Aggregates Swiss cadastral data (Amtliche Vermessung) with GWR building attributes | Active | FME | geodienste.ch, housing-stat.ch |
-| [volume-estimator](volume-estimator/) | Estimates building volumes using swissALTI3D/swissSURFACE3D elevation models | Active | Python, FME | swissALTI3D, swissSURFACE3D |
+| [volume-estimator](volume-estimator/) | Estimates building volumes using swissALTI3D/swissSURFACE3D elevation models | Active | Python | swissALTI3D, swissSURFACE3D |
 | [area-estimator](area-estimator/) | Calculates gross floor areas from volumes using GWR building classifications | Active | Python | GWR, PostGIS |
 | [roof-estimator](roof-estimator/) | Estimates roof characteristics of buildings | In Development | - | TBD |
 | [biodoversity-estimator](biodoversity-estimator/) | Estimates biodiversity metrics for buildings and surroundings | In Development | - | TBD |