Refactored AdvisoryLock to more extendable form

Author: Maciej Rosiek

src/main/java/de/zalando/sprocwrapper/SProcCall.java

@@ -13,7 +13,7 @@
 /**
  * @author  jmussler
  */
-@Retention(RetentionPolicy.SOURCE)
+@Retention(RetentionPolicy.RUNTIME)
 @Target(ElementType.METHOD)
 @Inherited
 public @interface SProcCall {