chore(travis): update to test against LTS versions of node + 10.x

mbroadst · mbroadst · commit 99801ca91596 · 2018-06-06T11:15:55.000-04:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,8 +1,6 @@
 language: node_js
 node_js:
-  - "0.10"
-  - "0.12"
-  - "4"
-  - "5"
-  - "6"
-  - "7"
+  - 4
+  - 6
+  - 8
+  - 10
