Fix appcontroller.conf line to include env=

README

@@ -5,6 +5,6 @@ DeviceLauncher accesses GPIO ports and requires root access.
 Usage: DeviceLauncher [--output-directory=OUTPUT_DIR]
 
 Boottime-EGL is a library for the target device. By default the libraries are deployed to /usr/lib but you can use any directory you wish.
-To use the libraries, edit /etc/appcontroller.conf to include line LD_PRELOAD=/usr/lib/libBoottime_iMX6_EGL.so. 
+To use the libraries, edit /etc/appcontroller.conf to include line env=LD_PRELOAD=/usr/lib/libBoottime_iMX6_EGL.so. 
 This preloads the Boottime-libBoottime_iMX6_EGL library that waits for buffer swap and raises a GPIO pin when the first buffer swap happens.