Once again, Microsoft has launched a revised version of the low-end Windows phone – Nokia Lumia 530. Comparing the new Lumia 530 to the Lumia 520, there are a few small improvements. The processor has been bumped from dual-core to a 1.2GHz quad-core Snapdragon 200 chip, the 4-inch screen resolution gets a very slight increase to 854 x 480 while…