bumped scikit-learn version: >= 0.20.2

Author: florian

.travis.yml

@@ -16,7 +16,7 @@ env:
     # The versions should match the minimal requirements in requirements.txt and setup.py
     - DISTRIB="conda" PYTHON_VERSION="2.7" CYTHON_VERSION="0.21"
       NUMPY_VERSION="1.11.1" PANDAS_VERSION="0.21.1" PATSY_VERSION="0.4.1"
-      SCIKIT_VERSION="0.17.1" SCIPY_VERSION="0.17.0" STATSMODELS_VERSION="0.6.1"
+      SCIKIT_VERSION="0.20.2" SCIPY_VERSION="0.17.0" STATSMODELS_VERSION="0.6.1"
     - DISTRIB="conda" PYTHON_VERSION="3.5" COVERAGE="true" CYTHON_VERSION="0.23.4"
       NUMPY_VERSION="1.11.1" PANDAS_VERSION="0.21.1" PATSY_VERSION="0.4.1"
       SCIKIT_VERSION="0.17.1" SCIPY_VERSION="0.17.0" STATSMODELS_VERSION="0.6.1"