chore: add all active nodejs release lines to travis

spence-s · spence-s · commit 3ee2a8658697 · 2021-04-13T10:28:46.000-04:00
diff --git a/.travis.yml b/.travis.yml
@@ -2,6 +2,8 @@ language: node_js
 node_js:
   - 10
   - 12
+  - 14
+  - 15
 script:
   - npm run test-coverage
 after_success:
