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## Motivation PR #441 increased the minimum supported Rust version, but it only changed the Azure Pipelines CI configuration, and not the GitHub Actions one. Additionally, upstream changes to `tower` has broken some of the examples. ## Solution This branch bumps the MSRV on GitHub Actions as well, and comments out examples that depend on code broken upstream. Additionally, it turns out that — due to Cool Cargo Semver Reasons — it's more or less impossible to depend on both tokio 0.2.0-alpha.6 *and* tokio 0.2 release versions. This branch therefore just drops the 0.2.0-alpha.6 support; the next `tracing-futures` will be a breaking change anyway. Co-authored-by: David Barsky <me@davidbarsky.com> Signed-off-by: Eliza Weisman <eliza@buoyant.io>