Fix bug in Gaussian example

examples/other_examples/gaussian_example.py

@@ -31,7 +31,7 @@ class SimpleGaussianLikelihood(bilby.Likelihood):
         data: array_like
             The data to analyse
         """
-        bilby.Likelihood.__init__(parameters={'mu': None, 'sigma': None})
+        bilby.Likelihood.__init__(self, parameters={'mu': None, 'sigma': None})
         self.data = data
         self.N = len(data)