Specify versions and update Cargo.lock

Author: TomBebbington

Cargo.lock

@@ -9,7 +9,7 @@ license = "BSD-3-Clause"
 name = "llvm-alt"
 readme = "README.md"
 repository = "https://github.com/TomBebbington/llvm-rs"
-version = "0.3.2"
+version = "0.4.0"
 
 [lib]
 
@@ -19,6 +19,6 @@ name = "llvm"
 lto = true
 
 [dependencies]
-cbox = "*"
-libc = "*"
-llvm-sys = "*"
+cbox = "0.*"
+libc = "0.*"
+llvm-sys = "0.*"