Merge pull request #188 from taiki-e/rustc_version

Update rustc_version to 0.4

Author: smoelius

Cargo.lock

@@ -12,13 +12,13 @@ edition = "2018"
 
 [build-dependencies]
 xdg = "2.1"
-rustc_version = "0.3"
+rustc_version = "0.4"
 
 [dependencies]
 cc = "1.0"
 clap = "2.33"
 libc = "0.2.66"
-rustc_version = "0.3"
+rustc_version = "0.4"
 xdg = "2.1"
 lazy_static = { version = "1.4.0", optional = true }