Use rand-core 0.1.0-pre.0 release
diff --git a/Cargo.toml b/Cargo.toml
index ae39a57..8464242 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -36,7 +36,7 @@
 winapi = { version = "0.3", features = ["minwindef", "ntsecapi", "profileapi", "winnt"], optional = true }
 
 [dependencies]
-rand_core = { path = 'rand_core', default-features = false }
+rand_core = { version = '0.1.0-pre.0', default-features = false }
 
 log = { version = "0.4", optional = true }
 serde = {version="1", optional=true}