Merge pull request #434 from paulocsanz/master

Put everything behind a 'stable' feature to avoid future breaking changes

Cargo.toml

@@ -21,6 +21,7 @@ features = ["docs"]
 rustdoc-args = ["--cfg", "feature=\"docs\""]
 
 [features]
+default = []
 docs = ["unstable"]
 unstable = ["broadcaster"]
 

src/lib.rs

@@ -41,6 +41,7 @@
 //! features = ["unstable"]
 //! ```
 
+#![cfg(feature = "default")]
 #![cfg_attr(feature = "docs", feature(doc_cfg))]
 #![warn(missing_docs, missing_debug_implementations, rust_2018_idioms)]
 #![allow(clippy::mutex_atomic, clippy::module_inception)]