Update author_email in setup.py

setup.py

@@ -9,7 +9,7 @@
     description='Calculate the geographical distance between 2 points with extreme accuracy.',
     long_description=open('README.rst').read(),
     author='Maurycy Pietrzak',
-    author_email=['github.com@wayheavy.com'],
+    author_email='github.com@wayheavy.com',
     url='https://github.com/maurycyp/vincenty',
     packages=['vincenty'],
     license='Unlicense',