Update bytes requirement from 0.4.12 to 0.5.3

[dependabot-preview]

Updates the requirements on bytes to permit the latest version.

Release notes

Sourced from bytes's releases.

v0.5.3

Added

• must_use attributes to split, split_off, and split_to methods (#337).

Fix

• Potential freeing of a null pointer in Bytes when constructed with an empty Vec<u8> (#341, #342).
• Calling Bytes::truncate with a size large than the length will no longer clear the Bytes (#333).

Changelog

Sourced from bytes's changelog.

0.5.3 (December 12, 2019)

Added

• must_use attributes to split, split_off, and split_to methods (#337).

Fix

• Potential freeing of a null pointer in Bytes when constructed with an empty Vec<u8> (#341, #342).
• Calling Bytes::truncate with a size large than the length will no longer clear the Bytes (#333).

0.5.2 (November 27, 2019)

Added

• Limit methods into_inner, get_ref, get_mut, limit, and set_limit (#325).

0.5.1 (November 25, 2019)

Fix

• Growth documentation for BytesMut (#321)

0.5.0 (November 25, 2019)

Fix

• Potential overflow in copy_to_slice

Changed

• Increased minimum supported Rust version to 1.39.
• Bytes is now a "trait object", allowing for custom allocation strategies (#298)
• BytesMut implicitly grows internal storage. remaining_mut() returns
  usize::MAX (#316).
• BufMut::bytes_mut returns &mut [MaybeUninit<u8>] to reflect the unknown
  initialization state (#305).
• Buf / BufMut implementations for &[u8] and &mut [u8]
  respectively (#261).
• Move Buf / BufMut "extra" functions to an extension trait (#306).
• BufMutExt::limit (#309).
• Bytes::slice takes a RangeBounds argument (#265).
• Bytes::from_static is now a const fn (#311).
• A multitude of smaller performance optimizations.

Added

• no_std support (#281).
• get_*, put_*, get_*_le, and put_*le accessors for handling byte order.
• BorrowMut implementation for BytesMut (#185).

Removed

• IntoBuf (#288).
• Buf implementation for &str (#301).
• byteorder dependency (#280).
• iovec dependency, use std::IoSlice instead (#263).
• optional either dependency (#315).

... (truncated)

Commits

• 8ae3bb2 v0.5.3
• 8733f74 Assert the LSB is 0 when converting Vec into Bytes
• 17a8ac9 Fix conversion of empty vectors to Bytes
• a7fc527 Make Deref impls of Buf and BufMut forward more methods
• 7e80f3b Optimize BufMut for Vec and BytesMut (#338)
• a490821 Add must_use to split, split_off, and split_to
• af606aa Fix regression in Bytes::truncate (#333)
• 98951ba v0.5.2
• 171cffa Update README.md (#320)
• a642e1c Add accessors to Limit combinator (#325)
• Additional commits viewable in compare view

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[ebkalderon]

Blocked on #58.

[dependabot-preview]

Superseded by #90.