updating to latest firefox in travis

phillipskevin · phillipskevin · commit 029422e7e5ef · 2019-08-06T12:54:15.000-05:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,7 +1,7 @@
 language: node_js
 node_js: node
 addons:
-  firefox: '57.0'
+  firefox: latest
 dist: xenial
 services:
   - xvfb
