fix bigdecimal version with v0.4.5 to use threshold envs (#132)

* fix bigdecimal version with v0.4.5 to use threshold envs

* >=0.4.5

Author: sh-cha

Cargo.toml

@@ -104,7 +104,7 @@ tsu = "1.0.1"
 bytes = "1.4.0"
 parking_lot = "0.12.1"
 base64 = "0.21.7"
-bigdecimal = "0.4"
+bigdecimal = ">=0.4.5"
 bech32 = "0.11"
 triomphe = "0.1.9"
 tiny-keccak = { version = "2.0.2", features = ["keccak", "sha3"] }