drop Python 3.3

it's really hard to make it work in travis (and we don't support it
on master for quite some time), so skip it

.travis.yml

@@ -26,8 +26,6 @@ jobs:
       env: TACKPY=false
     - python: 2.7
       env: TACKPY=false
-    - python: 3.3
-      env: TACKPY=false
     - python: 3.4
       env: TACKPY=false
     - python: 3.5

README.md

@@ -84,7 +84,7 @@ Currently it is distributed under Gnu LGPLv2 license.
 Requirements:
 
 * Python 2.6 or higher is required.
-* Python 3.2 or higher is supported.
+* Python 3.3 or higher is supported.
 * python ecdsa library ([GitHub](https://github.com/warner/python-ecdsa),
   [PyPI](https://pypi.python.org/pypi/ecdsa))
 

setup.py

@@ -23,17 +23,18 @@
       package_data={
                     'package1': ['LICENSE', 'README.md']},
       install_requires=['ecdsa'],
+      python_requires=">=2.6, !=3.0.*, !=3.1.*, !=3.2.*",
       obsoletes=["tlslite"],
       classifiers=[
             'Development Status :: 4 - Beta',
             'Intended Audience :: Developers',
             'License :: OSI Approved :: GNU Lesser General Public License v2 (LGPLv2)',
             'Operating System :: OS Independent',
             'Programming Language :: Python',
+            "Programming Language :: Python :: 2",
             'Programming Language :: Python :: 2.6',
             'Programming Language :: Python :: 2.7',
-            'Programming Language :: Python :: 3.2',
-            'Programming Language :: Python :: 3.3',
+            "Programming Language :: Python :: 3",
             'Programming Language :: Python :: 3.4',
             'Programming Language :: Python :: 3.5',
             'Programming Language :: Python :: 3.6',