Upgrade to Gulp 4

This required the following changes in the Gulpfile: - Defining a series of tasks is no longer done with arrays, but with the `gulp.series` function. - Getting all tasks must now be done through the task registry. - Tasks that don't return anything must call `done` upon completion. Moreover, this upgrade allows us to use the latest Node.js on Travis CI again.
mozilla · Nov 18, 2018 · 35e66cf · 35e66cf
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commit 35e66cf
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diff --git a/.travis.yml b/.travis.yml
@@ -1,6 +1,6 @@
 language: node_js
 node_js:
-  - "10"
+  - node
 cache:
   directories:
     - node_modules