bump rand to 0.4

Igor Gnatenko · web-flow · commit f7657df27cd2 · 2017-12-31T15:02:40.000+01:00
diff --git a/Cargo.toml b/Cargo.toml
@@ -21,5 +21,5 @@ travis-ci = { repository = "rust-lang-nursery/tempdir" }
 appveyor = { repository = "rust-lang-libs/tempdir" }
 
 [dependencies]
-rand = "0.3"
+rand = "0.4"
 remove_dir_all = "0.3"
