Mention all main contributors ordered by last maintain day

Author: syrusakbary

setup.py

@@ -6,8 +6,8 @@
     description='GraphQL implementation for Python',
     url='https://github.com/graphql-python/graphql-core',
     download_url='https://github.com/graphql-python/graphql-core/releases',
-    author='Syrus Akbary',
-    author_email='[email protected]',
+    author='Syrus Akbary, Jake Heinz, Taeho Kim',
+    author_email='Syrus Akbary <[email protected]>, Jake Heinz <[email protected]>, Taeho Kim <[email protected]>',
     license='MIT',
     classifiers=[
         'Development Status :: 5 - Production/Stable',