README.md: Document protobuf feature (#531)
Signed-off-by: John Vandenberg <jayvdb@gmail.com>
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@ -18,6 +18,8 @@ Find the latest documentation at <https://docs.rs/prometheus>.
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This crate provides several optional components which can be enabled via [Cargo `[features]`](https://doc.rust-lang.org/cargo/reference/features.html):
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- `protobuf`: Protobuf support, enabled by default.
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- `gen`: To generate protobuf client with the latest protobuf version instead of
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using the pre-generated client.
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