Revert "statsmodels is required for some examples"

AustinRochford · AustinRochford · commit 9047dfada779 · 2017-05-30T21:51:32.000-04:00
This reverts commit 482e751.
diff --git a/requirements-dev.txt b/requirements-dev.txt
@@ -12,4 +12,3 @@ mock>=2.0.0; python_version < '3.4'
 pyflakes>=1.5.0
 pycodestyle>=2.3.1
 nose-parameterized==0.6.0
-statsmodels>=0.8.0
