Merge pull request #4 from Revertron/dependabot/cargo/num-bigint-0.4

Update num-bigint requirement from 0.2 to 0.4

Cargo.toml

@@ -22,7 +22,7 @@ web-view = { version = "0.7.2", features = [] }
 tinyfiledialogs = "3.3.10"
 serde = { version = "1.0.123", features = ["derive"] }
 serde_json = "1.0.42"
-num-bigint = "0.2"
+num-bigint = "0.4"
 num-traits = "0.2"
 bincode = "1.2.0"
 base64 = "0.11.0"