code cleanup

Author: rashtao

src/main/java/com/arangodb/entity/ReplicationFactor.java

@@ -37,7 +37,7 @@ static SatelliteReplicationFactor ofSatellite() {
 
     final class NumericReplicationFactor implements ReplicationFactor {
 
-        private Integer value;
+        private final Integer value;
 
         public NumericReplicationFactor(Integer value) {
             this.value = value;

src/main/java/com/arangodb/internal/cursor/entity/InternalCursorEntity.java

@@ -38,7 +38,7 @@ public final class InternalCursorEntity implements MetaAware {
 
     private String id;
     private Integer count;
-    private Extras extra = new Extras();
+    private final Extras extra = new Extras();
     private Boolean cached;
     private Boolean hasMore;
     private JsonNode result;
@@ -110,7 +110,7 @@ public void setMeta(Map<String, String> meta) {
 
     public static final class Extras {
         private CursorStats stats;
-        private Collection<CursorWarning> warnings = Collections.emptyList();
+        private final Collection<CursorWarning> warnings = Collections.emptyList();
 
         public CursorStats getStats() {
             return stats;