Update to a version of `mime` which has been patched for Regular Expr…

…ession Denial of Service vulnerability

This was discovered via https://nodesecurity.io/advisories/535

See broofa/node-mime#167 (comment) for more info

package.json

@@ -39,7 +39,7 @@
     "inherits": "^2.0.1",
     "load-ip-set": "^1.2.7",
     "memory-chunk-store": "^1.2.0",
-    "mime": "^1.3.4",
+    "mime": "^1.4.1",
     "multistream": "^2.0.5",
     "package-json-versionify": "^1.0.2",
     "parse-torrent": "^5.8.0",