chore: support newer versions of node

Kent C. Dodds · Kent C. Dodds · commit 2ee7773f5315 · 2019-07-12T09:17:49.000-06:00
diff --git a/.travis.yml b/.travis.yml
@@ -7,6 +7,8 @@ notifications:
   email: false
 node_js:
   - '8'
+  - '10'
+  - '12'
 script: npm run validate
 after_success: node src travis-after-success
 branches:
