chore(package): update pull-stream to version 3.6.12 (#2143)

Author: Alan Shaw

package.json

@@ -155,7 +155,7 @@
     "pull-ndjson": "~0.1.1",
     "pull-pushable": "^2.2.0",
     "pull-sort": "^1.0.1",
-    "pull-stream": "^3.6.9",
+    "pull-stream": "^3.6.12",
     "pull-stream-to-async-iterator": "^1.0.1",
     "pull-stream-to-stream": "^1.3.4",
     "pull-traverse": "^1.0.3",