add babel-runtime as a dep

Author: daviddias

package.json

@@ -14,7 +14,6 @@
     "release": "dignified-release",
     "release-minor": "dignified-release minor",
     "release-major": "dignified-release major"
-
   },
   "repository": {
     "type": "git",
@@ -44,6 +43,7 @@
     "rimraf": "^2.5.2"
   },
   "dependencies": {
+    "babel-runtime": "^6.6.1",
     "bl": "^1.1.2",
     "concat-stream": "^1.5.1",
     "level-js": "^2.2.3",