I'm running a .net core 2.0 app and using NLog Mongo for logging. Theres a way to get the connectionstring to NLog.Mongo from my appsettings file? Documentation says that I can specify a connection name (connectionName) to get from config file (<https://github.com/loresoft/NLog.Mongo>).

My appsettings.Development.json has the following:

```
  "DatabaseSettings": {
    "ConnectionString": "mongodb://localhost:27017",
    "Database": "myDbName",
    "IsSSL": false
  }

```

nlog.config

```
<target xsi:type="Mongo"
    name="mongoDefault"
    connectionName="DatabaseSettings"
    cappedCollectionSize="26214400">
  <property name="ThreadID" layout="${threadid}" bsonType="Int32" />
  <property name="ThreadName" layout="${threadname}" />
  <property name="ProcessID" layout="${processid}" bsonType="Int32" />
  <property name="ProcessName" layout="${processname:fullName=true}" />
  <property name="UserName" layout="${windows-identity}" />
</target>

```

When I run the app I got the error:

NLog.NLogConfigurationException: Can not resolve MongoDB ConnectionString. Please make sure the ConnectionString property is set