Update change log with RS232 support and add some notes in the examples
Update change log with RS232 support and add some notes in the examples

elafargue/cordovarduino,i-mars/cordovarduino,i-mars/cordovarduino,i-mars/cordovarduino,xseignard/cordovarduino,elafargue/cordovarduino,xseignard/cordovarduino,xseignard/cordovarduino,elafargue/cordovarduino