Use patched follow-redirects.

Fixes issue where connections remained open for too long.

Author: RubenVerborgh

package.json

@@ -25,7 +25,7 @@
   },
   "dependencies": {
     "asynciterator": "^1.1.0",
-    "follow-redirects": "^0.2.0",
+    "follow-redirects": "RubenVerborgh/follow-redirects#feature-requestproxy",
     "lodash": "~2.4.1",
     "lru-cache": "^4.0.1",
     "minimist": "^1.2.0",