Add iOS 13.3. (From Xcode_12_GM_seed.xip)

Author: iGhibli

DeviceSupport/13.3.zip

@@ -91,6 +91,7 @@ optional arguments:
    * 13.2 (FromXcode_11.2.1_GM_Seed) `2019/11/11`
    * 13.2 (FromXcode11.2.1(11B500)) `2019/11/15`
    * 13.2 (FromXcode11.3(11C29)) `2019/12/23`
+   * 13.3 (FromXcode_12_GM_seed_xip) `2020/09/16`
    * 13.4 (FromXcode_11.4_beta_3_xip) `2020/03/19`
    * 13.4 (FromXcode11.5 (11E608c)) `2020/05/22`
    * 13.5 (FromXocde_Beta_11.5) `2020/05/16`