ci: travis node config

ff6347 · ff6347 · commit d091f2e7547e · 2020-01-17T06:16:32.000+01:00
diff --git a/.travis.yml b/.travis.yml
@@ -7,6 +7,8 @@ notifications:
   email: false
 node_js:
   - '10'
+  - '12'
+  - '13'
 
 before_script:
   - npm prune
