Fix format warning

Author: latchdevel

README.md

@@ -5,6 +5,7 @@ Adaptation of ["RCSwitch"](https://github.com/sui77/rc-switch) Arduino library t
 Works on any **libc++** compatible system, such as macOS, FreeBSD, Linux, and even Windows.
 
 [![License: LGPL v3](https://img.shields.io/badge/License-LGPL%20v3-blue.svg)](https://www.gnu.org/licenses/lgpl-3.0)
+[![Build tests](https://github.com/latchdevel/rc-switch-lib/actions/workflows/BuildTest.yml/badge.svg)](https://github.com/latchdevel/rc-switch-lib/actions/workflows/BuildTest.yml)
 
 Originally developed for Arduino framework, it has been ported to Raspberry Pi using the WiringPi library.
 

example.cpp

@@ -37,7 +37,7 @@ int main(){
    // pulse_list = mySwitch.sendTriState("00000FFF0F0F");      // tri-state code
 
    // Optional: Display raw pulse list
-   printf("raw_pulses[%lu]={",static_cast<unsigned int>(pulse_list.size()));
+   printf("raw_pulses[%u]={",static_cast<unsigned int>(pulse_list.size()));
    pulse_list_t::iterator it=pulse_list.begin();
    while (it != pulse_list.end()){
       printf("%i",*it);
@@ -56,7 +56,7 @@ int main(){
 
       // Optional: Display decoded pulse list
       unsigned int* timings = mySwitch.getReceivedRawdata();
-      printf("dec_pulses[%lu]={",static_cast<unsigned int>(pulse_list.size()));
+      printf("dec_pulses[%u]={",static_cast<unsigned int>(pulse_list.size()));
       for (unsigned index = 1 ; index < pulse_list.size(); index++){
             printf("%u,",timings[index]);
       }