[Tests] on node v13

ljharb · ljharb · commit a7f6a8bb0dfb · 2020-01-15T22:32:16.000-08:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,6 +1,7 @@
 sudo: false
 language: node_js
 node_js:
+  - '13'
   - '12'
   - '11'
   - '10'
