Avoid version duplication

docker/__init__.py

@@ -12,7 +12,9 @@
 #    See the License for the specific language governing permissions and
 #    limitations under the License.
 
+from .version import version
+
+__version__ = version
 __title__ = 'docker-py'
-__version__ = '0.3.0'
 
 from .client import Client # flake8: noqa

docker/version.py

+version = "0.3.2-dev"
\ No newline at end of file

setup.py

@@ -11,13 +11,15 @@ if sys.version_info[0] == 3:
 else:
     requirements_file = './requirements.txt'
 
+exec(open('docker/version.py').read())
+
 test_requirements = []
 with open(requirements_file) as requirements_txt:
     requirements = [line for line in requirements_txt]
 
 setup(
     name="docker-py",
-    version='0.3.2-dev',
+    version=version,
     description="Python client for Docker.",
     packages=['docker', 'docker.auth', 'docker.unixconn', 'docker.utils'],
     install_requires=requirements + test_requirements,