Merge pull request #179 from ethereum/travis

Only build on stable node version (4, 6, 8) on travis

Author: chriseth

.travis.yml

@@ -1,8 +1,7 @@
 language: node_js
 node_js:
-  - '7'
+  - '8'
   - '6'
-  - '5'
   - '4'
 branches:
     # We need to whitelist the branches which we want to have "push" automation.

package.json

@@ -44,7 +44,7 @@
     "yargs": "^4.7.1"
   },
   "devDependencies": {
-    "ethereumjs-util": "^5.1.2",
+    "ethereumjs-util": "^5.1.4",
     "semistandard": "^11.0.0",
     "tape": "^4.5.1",
     "tape-spawn": "^1.4.2"