Use callable instead of inspect.isfunction

pangeo_forge_runner/commands/bake.py

@@ -2,7 +2,6 @@
 Command to run a pangeo-forge recipe
 """
 import hashlib
-import inspect
 import os
 import re
 import string
@@ -284,7 +283,7 @@ def start(self):
                 # Chain our recipe to the pipeline. This mutates the `pipeline` object!
                 # We expect `recipe` to either be a beam PTransform, or an object with a 'to_beam'
                 # method that returns a transform.
-                if inspect.isfunction(recipe):
+                if callable(recipe):
                     recipe(pipeline)
                 elif isinstance(recipe, PTransform):
                     # This means we are in pangeo-forge-recipes >=0.9