Don't install scripting.

Author: mcflugen

.travis.yml

@@ -33,7 +33,6 @@ install:
 - conda config --set always_yes yes --set changeps1 no
 - conda create -n _testing python=$TRAVIS_PYTHON_VERSION
 - source activate _testing
-- conda install scripting -c conda-forge
 - |
   if [[ "$TRAVIS_BRANCH" == "release" ]]; then
     conda install landlab -c conda-forge