enforce urllib3==1.20 (#580)

* 🚑 enforce urllib3==1.20

 #579

* 🚑 Bump version to v5.3.1

 #579

CHANGES.rst

@@ -2,6 +2,12 @@
 Changes
 =======
 
+**2017-04-17**
+
+*Released 5.3.1*
+
+- Hotfix release due to bug introduced by urllib3 version 1.21
+
 **2016-12-11**
 
 *Released 5.3*

docs/source/conf.py

@@ -61,7 +61,7 @@ author = u'Leandro Toledo'
 # The short X.Y version.
 version = '5.3'  # telegram.__version__[:3]
 # The full version, including alpha/beta/rc tags.
-release = '5.3.0'  # telegram.__version__
+release = '5.3.1'  # telegram.__version__
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.

requirements.txt

@@ -1,3 +1,3 @@
 future>=0.15.2
-urllib3>=1.10
+urllib3==1.20
 certifi

telegram/version.py

@@ -17,4 +17,4 @@
 # You should have received a copy of the GNU Lesser Public License
 # along with this program.  If not, see [http://www.gnu.org/licenses/].
 
-__version__ = '5.3.0'
+__version__ = '5.3.1'