TST: Removed legend.py from excluded pep8 testing since it now passes

Author: cimarronm

lib/matplotlib/tests/test_coding_standards.py

@@ -178,7 +178,6 @@ def test_pep8_conformance_installed_files():
                           'font_manager.py',
                           'fontconfig_pattern.py',
                           'gridspec.py',
-                          'legend.py',
                           'legend_handler.py',
                           'mathtext.py',
                           'patheffects.py',