Cache node_modules

Author: mjackson

.travis.yml

@@ -2,8 +2,9 @@ language: node_js
 node_js: 8
 cache:
   directories:
-  - "$HOME/.cache/yarn"
-  - "$HOME/.pkg-cache"
+  - $HOME/.cache/yarn
+  - $HOME/.pkg-cache
+  - node_modules
 env:
   global:
   - secure: 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