Fix PEP 8 check

Author: pllim

jdaviz/configs/imviz/plugins/aper_phot_simple/aper_phot_simple.py

@@ -361,7 +361,8 @@ def vue_do_aper_phot(self, *args, **kwargs):
                     fitter = LevMarLSQFitter()
                     y_max = y_data.max()
                     x_mean = x_data[np.where(y_data == y_max)].mean()
-                    std = 0.5 * (phot_table['semimajor_sigma'][0] + phot_table['semiminor_sigma'][0])
+                    std = 0.5 * (phot_table['semimajor_sigma'][0] +
+                                 phot_table['semiminor_sigma'][0])
                     if isinstance(std, u.Quantity):
                         std = std.value
                     gs = Gaussian1D(amplitude=y_max, mean=x_mean, stddev=std)