Merge pull request #311 from rudderlabs/hotfix/facebook_pixel

add sha256 missed import

integrations/FacebookPixel/browser.js

@@ -1,6 +1,7 @@
 /* eslint-disable class-methods-use-this */
 import is from "is";
 import each from "@ndhoule/each";
+import sha256 from "crypto-js/sha256";
 import ScriptLoader from "../ScriptLoader";
 import logger from "../../utils/logUtil";
 import { getHashFromArray } from "../utils/commonUtils";