openpgp: take ownership of Features bitfield

- Since `set_features` requires ownership of `Features`, it should take
  ownership rather than borrowing and cloning them.
  See https://rust-lang.github.io/api-guidelines/flexibility.html#caller-decides-where-to-copy-and-place-data-c-caller-control .

- See #616.

1 files changed, 1 insertions, 1 deletions

diff --git a/openpgp/src/types/mod.rs b/openpgp/src/types/mod.rs
index 5872ebb4..4fd25e50 100644
--- a/openpgp/src/types/mod.rs
+++ b/openpgp/src/types/mod.rs
@@ -691,7 +691,7 @@ impl Arbitrary for SymmetricAlgorithm {
 /// # fn main() -> openpgp::Result<()> {
 /// let features = Features::empty().set_aead();
 /// let mut builder = SignatureBuilder::new(SignatureType::DirectKey)
-///     .set_features(&features)?
+///     .set_features(features)?
 ///     .set_preferred_aead_algorithms(vec![
 ///         AEADAlgorithm::EAX,
 ///     ])?;