Fix type

README.md

@@ -26,8 +26,6 @@ The following libraries are required to run Heartbeat:
 
 * [OpenCV]
 
-* Note: 
-
 They must be installed on the system such that headers and libraries are found on the compiler's standard search path.
 
 ### Installation
@@ -36,7 +34,7 @@ Compile the source code for your system, providing a number of required linker f
 This works with opencv 3.4.1 on macOS:
 
 ```sh
-$ g++ g++ -std=c++11 -lopencv_core -lopencv_highgui -lopencv_imgcodecs -lopencv_imgproc -lopencv_objdetect -lopencv_video -lopencv_videoio -lavcodec Heartbeat.cpp opencv.cpp RPPG.cpp Baseline.cpp -o Heartbeat
+$ g++ -std=c++11 -lopencv_core -lopencv_highgui -lopencv_imgcodecs -lopencv_imgproc -lopencv_objdetect -lopencv_video -lopencv_videoio -lavcodec Heartbeat.cpp opencv.cpp RPPG.cpp Baseline.cpp -o Heartbeat
 ```
 
 Alternative compilation for Ubuntu. Works with opencv 3.1: