[Tests] test on node v14 and v15, and remove v11 and v13

ljharb · ljharb · commit ef839f73cedf · 2020-12-23T08:46:10.000-08:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,9 +1,9 @@
 sudo: false
 language: node_js
 node_js:
-  - '13'
+  - '15'
+  - '14'
   - '12'
-  - '11'
   - '10'
   - '8'
   - '6'
