ci(travis): run only on lts versions of Node

dnlup · dnlup · commit b6ac90386410 · 2020-06-20T10:45:11.000+02:00
diff --git a/.travis.yml b/.travis.yml
@@ -4,11 +4,9 @@ os:
   - windows
 language: node_js
 node_js:
-  - "8"
-  - "9"
   - "10"
-  - "11"
   - "12"
+  - "14"
 branches:
   only:
     - current
