Update x25519-dalek requirement from 0.6 to 1.1

[dependabot-preview[bot]]

Updates the requirements on x25519-dalek to permit the latest version.

Changelog

Sourced from x25519-dalek's changelog.

1.1.0

• Add impls of PartialEq, Eq, and Hash for PublicKey (by @jack-michaud)

1.0.1

• Update underlying curve25519_dalek library to 3.0.

1.0.0

• Widen generic bound on EphemeralSecret::new and StaticSecret::new to allow owned as well as borrowed RNGs.
• Add PublicKey::to_bytes and SharedSecret::to_bytes, returning owned byte arrays, complementing the existing as_bytes methods returning references.
• Remove mention of deprecated rand_os crate from examples.
• Clarify EphemeralSecret/StaticSecret distinction in documentation.

0.6.0

• Updates rand_core version to 0.5.
• Adds serde support.
• Replaces clear_on_drop with zeroize.
• Use Rust 2018.

0.5.2

• Implement Clone for StaticSecret.

0.5.1

• Implement Copy, Clone, Debug for PublicKey.
• Remove doctests.

0.5.0

• Adds support for static and ephemeral keys.

Commits

• e8615a9 bump version to 1.1.0 and update CHANGELOG
• 1ede527 Merge pull request #63 from jack-michaud/derive-partialeq
• 3c09664 Feedback from @hdevalence - Added derive for Eq and Hash
• 48df927 Add PartialEq derive to PublicKey
• fd12c03 Merge branch 'master' into develop
• d438d48 Merge branch 'release/1.0.1'
• af6d5bd Bump version to 1.0.1
• b8e6fb7 Merge pull request #62 from dalek-cryptography/curve-3
• 2408e6b Update curve25519-dalek to version 3.0.0.
• 1781dd3 Merge branch 'master' into develop
• Additional commits viewable in compare view

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[dependabot-preview[bot]]

Looks like x25519-dalek is up-to-date now, so this is no longer needed.