Update statsmodels.

requirements.txt

@@ -3,7 +3,7 @@ coveralls == 1.1
 mock == 1.3.0
 scipy == 1.0.0
 statistics == 1.0.3.5
-statsmodels == 0.8.0
+statsmodels == 0.9.0
 urllib3 == 1.24.1
 redash_client == 0.2.5
 nose == 1.3.7

setup.py

@@ -13,7 +13,7 @@ setup(
     "boto3 == 1.4.4",
     "scipy == 1.0.0",
     "statistics == 1.0.3.5",
-    "statsmodels == 0.6.1",
+    "statsmodels == 0.9.0",
     "urllib3 == 1.24.1",
     "redash_client == 0.2.5"
   ]

test_requirements.txt

@@ -3,6 +3,6 @@ coveralls == 1.1
 flake8 == 3.3.0
 mock == 1.3.0
 statistics == 1.0.3.5
-statsmodels == 0.6.1
+statsmodels == 0.9.0
 urllib3 == 1.24.1
 redash_client == 0.2.5