fix travis

.travis.yml

@@ -1,10 +1,6 @@
 language: python
-cache:
-  yarn: true
-  pip: true
 matrix:
   include:
-  - env: 3
   - env: GROUP=js
   - env: GROUP=js_cov
   - env: GROUP=python
@@ -19,8 +15,9 @@ matrix:
   - env: GROUP=cli
   - env: GROUP=docs
 env:
-  - GH_REF: github.com/jupyterlab/jupyterlab.git
-  - secure: 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
+  global:
+    - GH_REF=github.com/jupyterlab/jupyterlab.git
+    - secure: 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
 install:
 - bash ./scripts/travis_install.sh
 script: