Resolving broken CI

.travis.yml

@@ -1,9 +1,16 @@
 language: node_js
 node_js:
   - 10
+addons:
+  apt:
+    packages:
+      # Ubuntu 16+ does not install this dependency by default, so we need to install it ourselves
+      - libgconf-2-4
 cache:
+  # Caches $HOME/.npm when npm ci is default script command
+  # Caches node_modules in all other cases
+  npm: true
   directories:
-    - ~/.npm
     - ~/.cache
 install:
   - npm ci