Rename config.json to aos_config.json

Plenty of other things are called config.json, so let's pick a more
unique name.

Change-Id: I6510a172ec62674dd1b11bd71cef9aac2480c612
Signed-off-by: Austin Schuh <austin.linux@gmail.com>
diff --git a/y2018/vision/vision_status.cc b/y2018/vision/vision_status.cc
index ca11dd8..ef3fd5a 100644
--- a/y2018/vision/vision_status.cc
+++ b/y2018/vision/vision_status.cc
@@ -15,7 +15,7 @@
 
 int Main() {
   aos::FlatbufferDetachedBuffer<aos::Configuration> config =
-      aos::configuration::ReadConfig("config.json");
+      aos::configuration::ReadConfig("aos_config.json");
 
   ::aos::events::RXUdpSocket video_rx(5001);
   char data[65507];