change the declaration to use keyword args

Framework/PythonInterface/plugins/algorithms/WorkflowAlgorithms/SANSILLIntegration.py

@@ -163,8 +163,8 @@ class SANSILLIntegration(PythonAlgorithm):
         lambda_range_validator = CompositeValidator()
         lambda_range_validator.add(FloatArrayOrderedPairsValidator())
         lambda_range_validator.add(FloatArrayLengthValidator(2))
-        self.declareProperty(FloatArrayProperty('WavelengthRange', [1., 10.], lambda_range_validator),
-                             'Wavelength range [Angstrom] to be used in integration (TOF only).')
+        self.declareProperty(FloatArrayProperty(name='WavelengthRange', defaultValue=[1., 10.], validator=lambda_range_validator),
+                             doc='Wavelength range [Angstrom] to be used in integration (TOF only).')
 
     def PyExec(self):
         self._input_ws = self.getPropertyValue('InputWorkspace')