Release another 0.5.x with forward support of 0.6

A popular [pprof](https://crates.io/crates/pprof) crate relies on criterion 0.5, and it might take some time for it to be [updated](https://github.com/tikv/pprof-rs/pull/271). Would it make sense to release another patch to 0.5 version that actually relies on 0.6, and re-exports some internals from it? I get this error, which i think would go away if 0.5 actually reexports 0.6: ``` error[E0277]: the trait bound `PProfProfiler<'_, '_>: Profiler` is not satisfied --> martin/benches/bench.rs:74:49 | 74 | config = Criterion::default().with_profiler(PProfProfiler::new(1000, Output::Flamegraph(None))); | ------------- ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Profiler` is not implemented for `PProfProfiler<'_, '_>` | | | required by a bound introduced by this call | note: there are multiple different versions of crate `criterion` in the dependency graph --> /home/nyurik/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/criterion-0.6.0/src/profiler.rs:9:1 | 9 | pub trait Profiler { | ^^^^^^^^^^^^^^^^^^ this is the required trait | ::: martin/benches/bench.rs:2:5 | 2 | use criterion::async_executor::FuturesExecutor; | --------- one version of crate `criterion` used here, as a direct dependency of the current crate ... 7 | use pprof::criterion::{Output, PProfProfiler}; | ----- one version of crate `criterion` used here, as a dependency of crate `pprof` | ::: /home/nyurik/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/pprof-0.14.0/src/criterion.rs:32:1 | 32 | pub struct PProfProfiler<'a, 'b> { | -------------------------------- this type doesn't implement the required trait | ::: /home/nyurik/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/criterion-0.5.1/src/benchmark_group.rs:473:5 | 473 | pub trait Sealed {} | ---------------- this is the found trait = help: you can use `cargo tree` to explore your dependency tree note: required by a bound in `Criterion::<M>::with_profiler` --> /home/nyurik/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/criterion-0.6.0/src/lib.rs:470:29 | 470 | pub fn with_profiler<P: Profiler + 'static>(self, p: P) -> Criterion<M> { | ^^^^^^^^ required by this bound in `Criterion::<M>::with_profiler` ```