STYLE: fix flake8=3.4.1 (#18418)

jreback · web-flow · commit bdbd6549f741 · 2017-11-21T20:54:50.000-05:00
diff --git a/ci/install_travis.sh b/ci/install_travis.sh
@@ -107,7 +107,7 @@ time conda install -n pandas pytest>=3.1.0
 time pip install pytest-xdist moto
 
 if [ "$LINT" ]; then
-   conda install flake8
+   conda install flake8=3.4.1
    pip install cpplint
 fi
 
