Fix #222: serializers.yml does not override properties when it is an …

…external file

core/src/main/java/es/urjc/etsii/grafo/annotation/SerializerSource.java

@@ -10,6 +10,7 @@
 @Retention(RetentionPolicy.RUNTIME)
 @Documented
 @Configuration
+@Inherited
 @PropertySource(value = "classpath:serializers.yml", factory = YmlPropSourceFactory.class)
-@PropertySource(value = "serializers.yml", ignoreResourceNotFound = true, factory = YmlPropSourceFactory.class)
+@PropertySource(value = "file:serializers.yml", ignoreResourceNotFound = true, factory = YmlPropSourceFactory.class)
 public @interface SerializerSource {}