Close receiver first in MainDriver close.

I'm speculating there's a race or sequencing problem here that's causing
spurious warnings when the receiver loses its connection to the database
before it has been closed.

Certainly, it can't hurt to shut down the receiver first, then the
FormatDriver, before closing the mongoClient.

Author: prdoyle

bosk-mongo/src/main/java/works/bosk/drivers/mongo/MainDriver.java

@@ -362,12 +362,12 @@ public MongoStatus readStatus() throws Exception {
 
 	@Override
 	public void close() {
+		receiver.close();
+		formatDriver.close();
 		if (!isClosed.getAndSet(true)) {
 			// It's important we don't call this twice, or else it will throw
 			mongoClient.close();
 		}
-		receiver.close();
-		formatDriver.close();
 	}
 
 	/**