make sure winreg is only on windows

Author: HJfod

Cargo.toml

@@ -28,6 +28,8 @@ walkdir = "2"
 zip = "0.5.13"
 semver = "1.0.14"
 reqwest = { version = "0.11.12", features = ["json", "blocking"] }
+
+[target.'cfg(windows)'.dependencies]
 winreg = "0.7.0"
 
 [build-dependencies]