drop old versions from travis

This drops node 6, which is still technically supported, but modern tap is a compelling draw.
npm · Jun 7, 2019 · 9a290ec · 9a290ec
1 parent 4782b1f
commit 9a290ec
Showing 1 changed file with 2 additions and 4 deletions.
diff --git a/.travis.yml b/.travis.yml
@@ -1,8 +1,6 @@
 sudo: false
 language: node_js
 node_js:
-  - '9'
+  - '12'
+  - '10'
   - '8'
-  - '7'
-  - '6'
-  - '4'