Merge pull request #19 from restify/greenkeeper-bunyan-1.8.0

bunyan@1.8.0 breaks build 🚨

Author: micahr

package.json

@@ -95,7 +95,7 @@
   },
   "dependencies": {
     "assert-plus": "^0.2.0",
-    "bunyan": "^1.5.1",
+    "bunyan": "^1.8.0",
     "csv": "^0.4.6",
     "escape-regexp-component": "^1.0.2",
     "formidable": "^1.0.17",