Make testbench an optional dependency

Author: HadrienG2

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "triple_buffer"
-version = "3.0.0"
+version = "3.0.1"
 authors = ["Hadrien G. <[email protected]>"]
 description = "An implementation of triple buffering, useful for sharing frequently updated data between threads"
 documentation = "https://docs.rs/triple_buffer/"
@@ -22,4 +22,6 @@ travis-ci = { repository = "HadrienG2/triple-buffer", branch = "master" }
 
 [dependencies]
 crossbeam-utils = "0.5"
+
+[dev-dependencies]
 testbench = "0.5"

src/lib.rs

@@ -74,7 +74,7 @@
 #![deny(missing_docs)]
 
 extern crate crossbeam_utils;
-extern crate testbench;
+#[cfg(test)] extern crate testbench;
 
 use crossbeam_utils::CachePadded;