Merge branch '540-multidimensional-gaussian-example-failing' into 'master'

Resolve "Multidimensional Gaussian Example Failing"

Closes #540

See merge request !901

examples/core_examples/multidimensional_gaussian.py

@@ -33,6 +33,7 @@ class MultidimGaussianLikelihood(bilby.Likelihood):
         """
 
     def __init__(self, data, dim):
+        super().__init__()
         self.dim = dim
         self.data = np.array(data)
         self.N = len(data)