ci: swap node v8 to v12

nodkz · nodkz · commit 3c1c17d47274 · 2020-02-11T00:35:23.000+06:00
diff --git a/.travis.yml b/.travis.yml
@@ -9,7 +9,7 @@ notifications:
   email: true
 node_js:
   - "10"
-  - "8"
+  - "12"
 script:
   - yarn run test
   - yarn run build
