Auto merge of #8547 - ThePuzzlemaker:patch-1, r=ehuss

Include `+` for crates.io feature requirements in the Cargo Book section on features

This change was introduced in commit 5f842f7 of rust-lang/crates.io but was not subsequently added to the Cargo Book.
This commit is contained in:
bors 2020-07-27 14:32:42 +00:00
commit 4ca9089f72

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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