add detail about insert key for env variable

coreyarnold · coreyarnold · commit db1359b7e207 · 2021-03-18T18:21:32.000-07:00
diff --git a/README.md b/README.md
@@ -14,7 +14,7 @@ sample `.env` file content:
 ```
 MAPBOX_TOKEN={YOUR KEY}
 imageKEY={YOUR KEY}
-
+NEWRELIC_INSERT_KEY={YOUR KEY}
 ```
 
 2. initialise mongodb
