chore(packages): ugprade nan@2.9.2 (#1503)

Author: reconbot

package.json

@@ -59,7 +59,7 @@
     "bindings": "1.3.0",
     "commander": "^2.13.0",
     "debug": "^3.1.0",
-    "nan": "^2.6.2",
+    "nan": "^2.9.2",
     "prebuild-install": "^2.4.1",
     "promirepl": "^1.0.1",
     "prompt-list": "^3.1.2",