[Feature] Legacy API (#224)

Co-authored-by: Tim Lorsbach <tim@lorsba.ch>
Reviewed-on: enviPath/enviPy#224

utilities/chem.py

@@ -65,7 +65,7 @@ class PredictionResult(object):
         return iter(self.product_sets)
 
     def __repr__(self):
-        return f"--{self.probability}/{self.rule}--> {self.product_sets}"
+        return f"--{self.probability:.2f}/{self.rule}--> {self.product_sets}"
 
 
 class FormatConverter(object):