Update PIO platforms comment

code/platformio.ini

@@ -17,6 +17,8 @@ data_dir = espurna/data
 #   arduino core 2.5.1 = platformIO 2.1.1 (unsupported)
 #   arduino core 2.5.2 = platformIO 2.2.3 (unsupported)
 #   arduino core 2.6.1 = platformIO 2.3.0
+#   arduino core 2.6.2 = platformIO 2.3.1
+#   arduino core 2.6.3 = platformIO 2.3.2
 # ------------------------------------------------------------------------------
 arduino_core_2_3_0 = espressif8266@1.5.0
 arduino_core_2_4_0 = espressif8266@1.6.0