Update README.md

Author: mathiasbredholt

README.md

@@ -21,17 +21,5 @@ extern "C" void app_main()
 }
 ```
 
-## Compile from source (does not work right now)
-* Clone repository
-```
-git clone --recursive https://github.com/mathiasbredholt/libmapper-arduino.git
-```
-* Until the issue in https://github.com/mathiasbredholt/libmapper-arduino/issues/3 gets fixed the file in `~/Library/Arduino15/packages/esp32/hardware/esp32/1.0.4/tools/sdk/include/lwip/arpa/inet.h` needs to be updated as described in the issue.
-* Run
-```
-mkdir build
-cd build
-cmake ..
-make
-```
-* The Arduino library will be compiled to build/Arduino/libmapper
+## Updating library
+- Run `update-library.sh`