Improving pep8 compliance of setup.py

setup.py

@@ -49,7 +49,8 @@ DESCRIPTION = 'Python package for audio data structures with missing entries'
 LICENSE = 'GNU General Public License v3 (GPLv3)'
 URL = 'https://gitlab.lis-lab.fr/skmad-suite/madarrays'
 AUTHOR = 'Ronan Hamon, Valentin Emiya, and Florent Jaillet'
-AUTHOR_EMAIL = 'ronan.hamon@lis-lab.fr, valentin.emiya@lis-lab.fr, florent.jaillet@lis-lab.fr'
+AUTHOR_EMAIL = ('ronan.hamon@lis-lab.fr, valentin.emiya@lis-lab.fr, '
+                'florent.jaillet@lis-lab.fr')
 INSTALL_REQUIRES = ['matplotlib',
                     'numpy',
                     'scipy',
@@ -70,7 +71,7 @@ CLASSIFIERS = [
     'Programming Language :: Python :: 3.5',
     'Programming Language :: Python :: 3.6']
 PYTHON_REQUIRES = '>=3.5'
-EXTRA_REQUIRE = {
+EXTRAS_REQUIRE = {
     'dev': ['coverage', 'pytest', 'pytest-cov', 'pytest-randomly', 'ipython'],
     'doc': ['sphinx', 'nbsphinx', 'numpydoc', 'sphinx-paramlinks']}
 PROJECT_URLS = {'Bug Reports': URL + '/issues',
@@ -129,7 +130,7 @@ def setup_package():
           packages=find_packages(exclude=['doc', 'dev']),
           install_requires=INSTALL_REQUIRES,
           python_requires=PYTHON_REQUIRES,
-          extras_require=EXTRA_REQUIRE,
+          extras_require=EXTRAS_REQUIRE,
           project_urls=PROJECT_URLS)