remove unused dep

Author: dignifiedquire

package.json

@@ -57,7 +57,6 @@
     "pull-pushable": "^2.0.1",
     "pull-stream": "^3.4.3",
     "pull-traverse": "^1.0.3",
-    "pull-window": "^2.1.4",
     "pull-write": "^1.0.2",
     "run-parallel": "^1.1.6"
   },