updated dependencies

Author: Matt Morgan

.travis.yml

@@ -1,8 +1,8 @@
 language: node_js
 node_js:
-  - stable
+  - 12
+  - 10
   - 8
-  - 6
 
 after_success:
-  - bash <(curl -s https://codecov.io/bash)
+  - bash <(curl -s https://codecov.io/bash)