revert cargo toml change.

Author: chriseth

Cargo.toml

@@ -6,7 +6,7 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-yultsur = { git = "https://github.com/leonardoalt/yultsur", branch = "datacopy" }
+yultsur = { git = "https://github.com/leonardoalt/yultsur", branch = "main" }
 num-bigint = "^0.4.3"
 tempfile = "3"
 clap = "^3.2"