Pinned gdal and shapely

.travis.yml

@@ -27,7 +27,7 @@ jobs:
         - conda create -q -n test-environment python=$TRAVIS_PYTHON_VERSION
         - source activate test-environment
       install:
-        - conda install -c conda-forge nose numpy matplotlib bokeh pandas scipy jupyter ipython param flake8 mock filelock iris cartopy xarray geopandas numpy --quiet
+        - conda install -c conda-forge nose numpy matplotlib bokeh pandas scipy jupyter ipython param flake8 mock filelock iris cartopy xarray geopandas numpy shapely=1.6.3 gdal=2.2.3 libgdal=2.2.3 glib=2.55.0 gstreamer=1.8.0 --quiet
         - pip install coveralls
         - pip install git+https://github.com/ioam/holoviews.git
         - python setup.py install