When logging ConfigurationSource only use the simpleName

I think that is sufficient to identify the source and the full name seems a tad ugly for my liking

Author: rbygrave

avaje-config/src/main/java/io/avaje/config/CoreConfiguration.java

@@ -123,7 +123,7 @@ void initSystemProperties() {
   private void loadSources(Set<String> names) {
     for (ConfigurationSource source : sources) {
       source.load(this);
-      names.add("ConfigurationSource:" + source.getClass().getCanonicalName());
+      names.add("ConfigurationSource:" + source.getClass().getSimpleName());
     }
   }