code: public function getHandlerMethodName($withMajor = true)
      {
          if (true === $withMajor) {
              return lcfirst($this->classShortName);
          }
  
          return lcfirst(str_replace('V' . $this->id->getVersion()->getMajor(), '', $this->classShortName));
      }
docs: Convenience method to return the name of the method that should
  exist to handle this message.
  
  For example, an ImportUserV1 message would be handled by:
  SomeClass::importUserV1(ImportUserV1 $command)
  
  @param bool $withMajor
  
  @return string