Bump version and update news

NEWS.md

@@ -1,5 +1,12 @@
 # Changelog
 
+## 2.91.2
+Released 2017-mm-dd
+
+Announcements:
+ - Upgrades grainstore to [1.6.3](https://github.com/CartoDB/grainstore/releases/tag/1.6.3).
+
+
 ## 2.91.1
 Released 2017-04-24
 

npm-shrinkwrap.json

@@ -1,6 +1,6 @@
 {
   "name": "windshaft-cartodb",
-  "version": "2.91.1",
+  "version": "2.91.2",
   "dependencies": {
     "body-parser": {
       "version": "1.14.2",

package.json

@@ -1,7 +1,7 @@
 {
   "private": true,
   "name": "windshaft-cartodb",
-  "version": "2.91.1",
+  "version": "2.91.2",
   "description": "A map tile server for CartoDB",
   "keywords": [
     "cartodb"