add checkpoint 300000

lib/src/lightclient/checkpoints.rs

@@ -90,6 +90,10 @@ fn get_main_checkpoint(height: u64) ->  Option<(u64, &'static str, &'static str)
 
 "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"
 ),
+(300000,  "000000033322d90275a09f4094e5c43db1f7017f788145d5a0edfa8200ecedad",
+
+"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"
+),
 ];
 
     find_checkpoint(height, checkpoints)