Update setup information

Remove Python 2 and update author email addresses

setup.py

@@ -7,7 +7,7 @@
 
 setup(
     name='aotools',
-    author_email='a.p.reeves@durham.ac.uk',
+    author_email='[email protected], matthew.townson@durham.ac.uk',
     url='https://github.com/aotools/aotools',
     packages=['aotools',
               'aotools.astronomy',
@@ -26,11 +26,8 @@
     ],
     classifiers=[
         "Programming Language :: Python",
-        "Programming Language :: Python :: 2",
-        "Programming Language :: Python :: 2.7",
         "Programming Language :: Python :: 3",
-        "Programming Language :: Python :: 3.5",
         "Programming Language :: Python :: 3.6",
         "Programming Language :: Python :: 3.7",
     ],
-)
+)