Remove std feature

Signed-off-by: Denis Varlakov <denis@dfns.co>

Author: survived

round-based/CHANGELOG.md

@@ -15,13 +15,15 @@
 * Use `core::error::Error` trait which is now always implemented for all errors regardless whether `std` feature
   is enabled or not [#14]
   * Update `thiserror` dependency to v2
+  * BREAKING: remove `std` feature, as the crate is fully no_std now
 
 Migration guidelines:
 * Replace `dev` feature with `sim`
 * Instead of using `round_based::simulation::Simulation` from previous version, use
   `round_based::simulation::{run, run_with_setup}`
 * Take advantage of `SimResult::{expect_ok, expect_eq}` to reduce amount of the code
   in your tests
+* Remove `std` feature, if it was explicitly enabled
 
 Other than simulation, there are no breaking changes in this release.
 

round-based/Cargo.toml

@@ -45,7 +45,6 @@ sim = ["state-machine"]
 sim-async = ["sim", "tokio/sync", "tokio-stream", "futures-util/alloc"]
 derive = ["round-based-derive"]
 runtime-tokio = ["tokio"]
-std = []
 
 [[test]]
 name = "derive"