CI: Added a worker for pandas-dev

Author: TomAugspurger

.travis.yml

@@ -50,7 +50,7 @@ jobs:
     - env: &py36_env
       - PYTHON=3.6
       - NUMPY=1.13.0
-      - PANDAS=0.20.2
+      - PANDAS=0.21.0.dev0
       - *no_coverage
       - *no_optimize
       - *imports

continuous_integration/travis/install.sh

@@ -82,6 +82,12 @@ pip install -q \
     xxhash \
     pycodestyle
 
+if [[ ${PANDAS} == '0.21.0.dev0' ]]; then
+    conda uninstall -y pandas
+    pip install --pre -f "https://7933911d6844c6c53a7d-47bd50c35cd79bd838daf386af554a83.ssl.cf2.rackcdn.com" pandas
+fi
+
+
 # Install dask
 pip install -q --no-deps -e .[complete]
 echo pip freeze