Update tempfile dev dependency

This eliminates the need to build multiple versions of cfg-if

Author: asomers

Cargo.toml

@@ -42,7 +42,7 @@ cc = "1"
 bytes = "0.4.8"
 lazy_static = "1.2"
 rand = "0.6"
-tempfile = "3.0.5"
+tempfile = "3.2.0"
 semver = "0.9.0"
 
 [target.'cfg(any(target_os = "android", target_os = "linux"))'.dev-dependencies]