travis: enforce gdal less than 2.0 for the sake of fiona

.travis.yml

@@ -34,7 +34,7 @@ env:
     fi
 install:
   # See https://gist.github.com/sgillies/f7bfff349a676cffb1ef
-  - conda create --yes -n env_name -c PinguCarsti python=$TRAVIS_PYTHON_VERSION pip cython numpy matplotlib pandas gdal gdal-data scipy
+  - conda create --yes -n env_name -c PinguCarsti python=$TRAVIS_PYTHON_VERSION pip cython numpy matplotlib pandas "gdal<2.0" gdal-data scipy
   - source activate env_name
   - GDAL_CONFIG=`which gdal-config` pip install rasterio
   - if [ ${TRAVIS_PYTHON_VERSION:0:1} == "2" ]; then conda install --yes imaging; else pip install pillow; fi
@@ -44,4 +44,4 @@ install:
   - "pip install -r requirements_dev.txt"
 script: "coverage run --include *rasterstats* setup.py test"
 after_success:
-  - coveralls
+  - coveralls