bump to v3.1.3 [publish binary]

CHANGELOG.md

 # Changelog
 
+## 3.1.3
+
+ - Upgrade to node-pre-gyp@0.6.26 with better support for Electron
+
 ## 3.1.2
 
  - Only providing binaries for node v0.10x, v0.12.x, v4, and v5

package.json

 {
     "name": "sqlite3",
     "description": "Asynchronous, non-blocking SQLite3 bindings",
-    "version": "3.1.2",
+    "version": "3.1.3",
     "homepage": "http://github.com/mapbox/node-sqlite3",
     "author": {
         "name": "MapBox",