Update 07_Deploying_to_the_Cloud.md

I was performing the tutorial and it wasn't working on the server or locally.  The .coroutine was missing from the earlier steps.

Author: babramovitch

Full Stack Web App with Kotlin Multiplatform/07_Deploying_to_the_Cloud.md

@@ -24,7 +24,7 @@ val connectionString: ConnectionString? = System.getenv("MONGODB_URI")?.let {
     ConnectionString("$it?retryWrites=false")
 }
 
-val client = if (connectionString != null) KMongo.createClient(connectionString) else KMongo.createClient()
+val client = if (connectionString != null) KMongo.createClient(connectionString).coroutine else KMongo.createClient().coroutine
 val database = client.getDatabase(connectionString?.database ?: "shoppingList")
 ```