change to nodejs

.travis.yml

@@ -1,3 +1,4 @@
+language: node_js
 cache:
   yarn: true
   directories:

scripts/travis_install.sh

@@ -28,7 +28,7 @@ conda update -q conda
 conda info -a # for debugging
 
 conda remove --name test --all || true
-conda create -q -n test --quiet -c conda-forge notebook nodejs pytest python=$PYTHON
+conda create -q -n test --quiet -c conda-forge notebook pytest python=$PYTHON
 set +ev
 source activate test
 set -ev