Include + for crates.io feature requirements

This change was introduced in commit 5f842f7 of rust-lang/crates.io.
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James 2020-07-27 01:58:55 -05:00 committed by GitHub
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commit e8d4bbfe17
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@ -87,7 +87,7 @@ optional dependencies. This allows packages to internally enable/disable
features without requiring a new dependency.
> **Note**: [crates.io] requires feature names to only contain ASCII letters,
> digits, `_`, or `-`.
> digits, `_`, `-`, or `+`.
### Usage in end products