replace isomorphic-fetch with fetch-with-proxy to enable outline to r…

…un behind a proxy

server/slack.js

@@ -1,6 +1,7 @@
 // @flow
 import querystring from "querystring";
-import fetch from "isomorphic-fetch";
+//import fetch from "isomorphic-fetch";
+import fetch from "fetch-with-proxy"
 import { InvalidRequestError } from "./errors";
 
 const SLACK_API_URL = "https://slack.com/api";

server/utils/updates.js

@@ -1,7 +1,8 @@
 // @flow
 import crypto from "crypto";
 import invariant from "invariant";
-import fetch from "isomorphic-fetch";
+//import fetch from "isomorphic-fetch";
+import fetch from "fetch-with-proxy";
 import packageInfo from "../../package.json";
 
 import { User, Team, Collection, Document } from "../models";