Update appsscript.json

Add scope required to get user's email

Author: Mansari

gmail-sentiment-analysis/appsscript.json

@@ -4,6 +4,7 @@
     "https://www.googleapis.com/auth/script.external_request",
     "https://www.googleapis.com/auth/cloud-platform",
     "https://www.googleapis.com/auth/script.locale",
+    "https://www.googleapis.com/auth/userinfo.email",
     "https://www.googleapis.com/auth/gmail.addons.execute",
     "https://www.googleapis.com/auth/gmail.labels",
     "https://www.googleapis.com/auth/gmail.modify"