Update to remove Python2 as supported version.

README.rst

@@ -18,7 +18,7 @@ workloads, instruments or output processing.
 Requirements
 ============
 
-- Python 2.7 or Python 3
+- Python 3
 - Linux (should work on other Unixes, but untested)
 - Latest Android SDK (ANDROID_HOME must be set) for Android devices, or
 - SSH for Linux devices

setup.py

@@ -111,7 +111,6 @@ params = dict(
         'Environment :: Console',
         'License :: OSI Approved :: Apache Software License',
         'Operating System :: POSIX :: Linux',
-        'Programming Language :: Python :: 2.7',
         'Programming Language :: Python :: 3',
     ],
 )