Turn optimization back on for testing

test/test.py

@@ -5,7 +5,6 @@ X = np.random.randn(100, 5)
 # Test 1
 y = X[:, 0]
 equations = pysr(X, y,
-                 julia_optimization=0,
                  niterations=100)
 print(equations)
 assert equations.iloc[-1]['MSE'] < 1e-10
@@ -14,7 +13,6 @@ assert equations.iloc[-1]['MSE'] < 1e-10
 y = X[:, 0]**2
 equations = pysr(X, y,
                  unary_operators=["square(x) = x^2"], binary_operators=["plus"],
-                 julia_optimization=0,
                  niterations=100)
 print(equations)
 assert equations.iloc[-1]['MSE'] < 1e-10