Merge pull request #28 from buxx/pyup-scheduled-update-2018-03-12

requirements.txt

 attrs==17.4.0
 cocos2d==0.6.5
 Dijkstar==2.4.0
-freezegun==0.3.9
+freezegun==0.3.10
 future==0.16.0
 numpy==1.14.1
 pluggy==0.6.0
 psutil==5.4.3
 py==1.5.2
 pyglet==1.3.1
-pytest==3.4.1
-python-dateutil==2.6.1
+pytest==3.4.2
+python-dateutil==2.7.0
 PyYAML==3.12
 redis==2.10.6
 six==1.11.0