#129 bump xlsx to 0.20.3 from SheetJS CDN instead of npm

Author: jayhill

serverless/package-lock.json

@@ -30,7 +30,7 @@
         "cheerio": "^1.0.0",
         "humanparser": "^2.7.0",
         "tough-cookie": "^5.1.2",
-        "xlsx": "^0.18.5"
+        "xlsx": "https://cdn.sheetjs.com/xlsx-0.20.3/xlsx-0.20.3.tgz"
     },
     "scripts": {
         "test": "jest",