Fixed testUpdatePopulation() to account for moving sorting population…

… into run() method.

tests/test_genalg.py

@@ -43,6 +43,7 @@ def testUpdatePopulation(self):
         for truss in ga.population:
             truss.fitness_score = np.random.random()
 
+        ga.population.sort(key=lambda x: x.fitness_score)
         ga.update_population()
 
         # Check that population is sorted by fitness_score