rustfmt: Create a rustfmt.toml with edition

rustfmt was unable to understand the edition in Cargo.toml, so we can add a hint to rustfmt.toml file. (see rust-lang/rust#61072)
mavlink · Jan 11, 2022 · 1b8dddf · 1b8dddf
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commit 1b8dddf
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/rustfmt.toml b/rustfmt.toml
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+edition = "2021"