feature(generator): generate reminder only when configuration present

src/ActivationReminder/Composer/PrepareActivationReminderCommand.php

@@ -33,6 +33,7 @@ class PrepareActivationReminderCommand extends BaseCommand
     {
 	    $output->writeln("Creating activation reminder.");
 
+	    if ( $this->package_has_activation_remider() ) {
 		    $classLoader = require( 'vendor/autoload.php' );
 
 		    $class_map = $classLoader->getClassMap();
@@ -66,6 +67,18 @@ class PrepareActivationReminderCommand extends BaseCommand
 		    $this->prepare_class( $random_class . $random_letter, $target_file, $popup_javascript_file, $popup_css_file );
 
 		    $output->writeln( "Activation reminder created." );
+	    } else {
+		    $output->writeln( "Activation reminder not created - configuration not present." );
+	    }
+    }
+
+	/**
+	 * @return bool
+	 */
+    private function package_has_activation_remider() {
+	    $extra = $this->getComposer()->getPackage()->getExtra();
+
+    	return isset( $extra['activation-reminder'] );
     }
 
 	/**