Fix for API changes in Hummingbird 0.1.0 (#427)

* fix API changes in HB 0.0.7

Signed-off-by: Matteo Interlandi <[email protected]>

* pin HB to 0.0.6 instead of fixing the API

Signed-off-by: Matteo Interlandi <[email protected]>

Author: interesaaat

requirements-dev.txt

@@ -19,4 +19,4 @@ xgboost
 catboost
 flake8
 torch==1.5.1+cpu
-hummingbird-ml
+hummingbird-ml==0.0.6