v0.2.3: increased required EXP on armband by 20%

src/com/shatteredpixel/shatteredpixeldungeon/items/artifacts/MasterThievesArmband.java

@@ -75,8 +75,8 @@ public class MasterThievesArmband extends Artifact {
                     exp += value;
                 }
             }
-            while(exp >= 500 && level < levelCap) {
+            while(exp >= 600 && level < levelCap) {
-                exp -= 500;
+                exp -= 600;
                 upgrade();
             }
             return true;