Fix cashe reading error

This merge request fixes the issue with reading cashe file when reconstructing samples from marginalized likelihood. This fixes issue #641 (closed)

bilby/core/utils/introspection.py

@@ -98,7 +98,7 @@ def infer_args_from_function_except_n_args(func, n=1):
         parameters = inspect.getfullargspec(func).args
     except AttributeError:
         parameters = inspect.getargspec(func).args
-    del(parameters[:n])
+    del (parameters[:n])
     return parameters