update req. to new version of ipython

CamDavidsonPilon · CamDavidsonPilon · commit 5ee54cdd7b2d · 2016-05-18T12:41:27.000-04:00
wow this hasn't been touched in some time: Closes #311
diff --git a/requirements.txt b/requirements.txt
@@ -1,4 +1,4 @@
-ipython>=0.13.2
+ipython>=2.0
 matplotlib>=1.2.1
 numpy>=1.7.1
 pymc==2.3.4
