Fix bug after scikit-release

Author: PrimozGodec

Orange/base.py

@@ -520,11 +520,10 @@ def params(self, value):
     def _get_sklparams(self, values):
         skllearner = self.__wraps__
         if skllearner is not None:
-            spec = inspect.getargs(skllearner.__init__.__code__)
-            # first argument is 'self'
-            assert spec.args[0] == "self"
-            params = {name: values[name] for name in spec.args[1:]
-                      if name in values}
+            spec = list(
+                inspect.signature(skllearner.__init__).parameters.keys()
+            )
+            params = {name: values[name] for name in spec if name in values}
         else:
             raise TypeError("Wrapper does not define '__wraps__'")
         return params