Put an upper bound to scikit-learn to avoid BTB crash

Author: csala

requirements.txt

@@ -7,7 +7,7 @@ numpy>=1.13.1
 pandas>=0.22.0
 pyyaml>=3.12
 requests>=2.18.4
-scikit-learn>=0.18.2
+scikit-learn>=0.18.2,<0.20
 scipy>=0.19.1
 sklearn-pandas>=1.5.0
 sqlalchemy>=1.1.14

setup.py

@@ -18,7 +18,7 @@
     'numpy>=1.13.1',
     'pandas>=0.22.0',
     'pyyaml>=3.12',
-    'scikit-learn>=0.18.2',
+    'scikit-learn>=0.18.2,<0.20',
     'scipy>=0.19.1',
     'sklearn-pandas>=1.5.0',
     'sqlalchemy>=1.1.14',