Add node 12, drop node 6

JamesMessinger · JamesMessinger · commit 68925b48f21c · 2019-08-25T08:21:42.000-05:00
diff --git a/.travis.yml b/.travis.yml
@@ -7,9 +7,9 @@ filter_secrets: false
 language: node_js
 
 node_js:
-  - 10
   - 8
-  - 6
+  - 10
+  - 12
 
 os:
   - linux
