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/y2016/vision/target_receiver.cc b/y2016/vision/target_receiver.cc
index 75a07a8..701f7e8 100644
--- a/y2016/vision/target_receiver.cc
+++ b/y2016/vision/target_receiver.cc
@@ -299,7 +299,7 @@
 
 void Main() {
   aos::FlatbufferDetachedBuffer<aos::Configuration> config =
-      aos::configuration::ReadConfig("config.json");
+      aos::configuration::ReadConfig("aos_config.json");
 
   ::aos::ShmEventLoop event_loop(&config.message());