#709 flake8 and changelog

Author: valentinsulzer

CHANGELOG.md

@@ -36,6 +36,7 @@
 
 ## Optimizations
 
+-   Now simplifying objects that are constant as soon as they are created ([#801](https://github.com/pybamm-team/PyBaMM/pull/801))
 -   Simplified solver interface ([#800](https://github.com/pybamm-team/PyBaMM/pull/800))
 -   Added caching for shape evaluation, used during discretisation ([#780](https://github.com/pybamm-team/PyBaMM/pull/780))
 -   Added an option to skip model checks during discretisation, which could be slow for large models ([#739](https://github.com/pybamm-team/PyBaMM/pull/739))

tests/unit/test_parameters/test_parameter_values.py

@@ -316,9 +316,6 @@ def test_process_function_parameter(self):
         processed_func = parameter_values.process_symbol(func)
         self.assertEqual(processed_func.evaluate(u={"func": 13}), 13)
 
-        
-
-
     def test_process_inline_function_parameters(self):
         def D(c):
             return c ** 2