Prepare release (#938)

* Fix import of interpret in __init__.py

* Use observed=False explicitly to avoid warning

Author: tomicapretto

bambi/__init__.py

@@ -11,6 +11,7 @@
 from bambi.formula import Formula
 from bambi.models import Model
 from bambi.priors import Prior
+from bambi import interpret
 
 __version__ = version("bambi")
 

bambi/interpret/utils.py

@@ -210,7 +210,7 @@ def average_over(data: pd.DataFrame, covariate: str | list[str]) -> pd.DataFrame
     if covariate == "all":
         return pd.DataFrame(data[data.columns[-3:]].mean()).T
     else:
-        return data.groupby(covariate, as_index=False)[data.columns[-3:]].mean()
+        return data.groupby(covariate, as_index=False, observed=False)[data.columns[-3:]].mean()
 
 
 def get_model_terms(model: Model) -> dict: