bump dependencies

npm-shrinkwrap.json

@@ -341,9 +341,9 @@
       "resolved": "https://registry.npmjs.org/cartodb-pecan/-/cartodb-pecan-0.2.0.tgz"
     },
     "cartodb.js": {
-      "version": "4.0.0-beta.21",
-      "from": "cartodb/cartodb.js#12845-implement-retina-basemaps",
-      "resolved": "git://github.com/cartodb/cartodb.js.git#edecedf0fbb224ed7dfff01e2d0fe39a7cba78c7"
+      "version": "4.0.0-beta.22",
+      "from": "cartodb/cartodb.js#v4",
+      "resolved": "git://github.com/cartodb/cartodb.js.git#6aa37ae6a84dd2746b0231e051c5257200bd5a35"
     },
     "center-align": {
       "version": "0.1.3",

package.json

@@ -26,7 +26,7 @@
     "carto-zera": "1.0.2",
     "cartocolor": "4.0.0",
     "cartodb-pecan": "0.2.x",
-    "cartodb.js": "CartoDB/cartodb.js#12845-implement-retina-basemaps",
+    "cartodb.js": "CartoDB/cartodb.js#v4",
     "clipboard": "1.6.1",
     "codemirror": "5.14.2",
     "d3-interpolate": "^1.1.6",