Add alternative undefined season which some media has

Author: rubengees

library/src/main/java/com/proxerme/library/parameters/SeasonParameter.java

@@ -14,6 +14,7 @@
  */
 public final class SeasonParameter {
 
+    public static final int UNSPECIFIED_ALT = 0;
     public static final int WINTER = 1;
     public static final int SPRING = 2;
     public static final int SUMMER = 3;
@@ -24,9 +25,9 @@ private SeasonParameter() {
     }
 
     /**
-     * An annotation that represents the possible season.
+     * An annotation that represents the possible seasons.
      */
-    @IntDef({SPRING, SUMMER, AUTUMN, WINTER, UNSPECIFIED})
+    @IntDef({UNSPECIFIED_ALT, SPRING, SUMMER, AUTUMN, WINTER, UNSPECIFIED})
     @Retention(value = RetentionPolicy.SOURCE)
     @Target({ElementType.METHOD, ElementType.FIELD, ElementType.PARAMETER})
     public @interface SeasonConstraint {