add sklearn explicitly to dependencies like nipreps/fmriprep@92830ad

Shoshana Berleant · Shoshana Berleant · commit fffd9b56737d · 2016-09-16T19:58:58.000Z
diff --git a/requirements.txt b/requirements.txt
@@ -13,3 +13,4 @@ psutil
 funcsigs
 configparser
 nilearn
+sklearn
