Switched travis build to Node 12

tsmx · tsmx · commit d655cceb1009 · 2020-10-13T12:27:49.000+02:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,4 +1,4 @@
 language: node_js
 node_js:
-  - 10
+  - 12
 after_success: npm run coveralls
