Update README.md

Author: ryohei sasaki

README.md

@@ -51,7 +51,7 @@ Clone and Build MapIV's fork of [RTKLIB](https://github.com/MapIV/RTKLIB/tree/rt
 Clone and build the necessary packages for Eagleye. 
 
 	cd $HOME/catkin_ws/src
-	git clone https://github.com/MapIV/eagleye.git
+	git clone https://github.com/MapIV/eagleye.git -b main-ros1
 	git clone https://github.com/MapIV/rtklib_ros_bridge.git
 	git clone https://github.com/MapIV/kml_generator
 	git clone https://github.com/MapIV/multi_rosbag_controller.git