Document changes in README, NEWS & setup.py

NEWS

@@ -1,8 +1,14 @@
 * Version 4.0.0 (not yet released)
  ** Major release: Changed backend from M2Crypto to cryptography
+ ** Added support for Python 3.3+ and PyPy 2.6+
  ** Added dependency on cryptography 1.2 or higher
  ** Removed dependency on M2Crypto
+ ** Fixed double hashing in attestation signatures and authentication
+    challenges
  ** utils.rand_bytes() now sources bytes from os.urandom()
+ ** utils.websafe_encode(), u2f_v2.RawRegistrationResponse.serialize(),
+    and u2f_v2.RawAuthenticationResponse.serialize() now all return
+    text strings (unicode() on Python 2.x, str() on Python 3.x)
 
 * Version 3.2.0 (released 2015-06-16)
  ** License change release: Changed license to BSD 2-clause.

README

@@ -1,6 +1,7 @@
 == u2flib-server
 Provides functionality for working with the server side aspects of the U2F
 protocol as defined in the link:http://fidoalliance.org/specifications/download[FIDO specifications].
+It supports Python 2.6-2.7, Python 3.3+ and PyPy 2.6+.
 
 To read more about U2F and how to use a U2F library, visit
 link:http://developers.yubico.com/U2F[developers.yubico.com/U2F].

setup.py

@@ -46,10 +46,17 @@
     classifiers=[
         'License :: OSI Approved :: BSD License',
         'Operating System :: OS Independent',
-        'Programming Language :: Python',
         'Development Status :: 5 - Production/Stable',
         'Intended Audience :: Developers',
         'Intended Audience :: System Administrators',
+        'Programming Language :: Python :: 2',
+        'Programming Language :: Python :: 2.6',
+        'Programming Language :: Python :: 2.7',
+        'Programming Language :: Python :: 3',
+        'Programming Language :: Python :: 3.3',
+        'Programming Language :: Python :: 3.4',
+        'Programming Language :: Python :: 3.5',
+        'Programming Language :: Python :: Implementation :: PyPy',
         'Topic :: Internet',
         'Topic :: Security :: Cryptography',
         'Topic :: Software Development :: Libraries :: Python Modules',