Update sized-chunks requirement from 0.1.2 to 0.2.0

[dependabot-preview]

Updates the requirements on sized-chunks to permit the latest version.

Changelog

Sourced from sized-chunks's changelog.

[0.2.0] - 2019-04-14

CHANGED

• The capacity() method has been replacied with a CAPACITY const on each
  type.

ADDED

• There is now a RingBuffer implementation, which should be nearly a drop-in
  replacement for SizedChunk but is always O(1) on push and cannot be
  dereferenced to slices (but it has a set of custom slice-like implementations
  to make that less of a drawback).
• The Drain iterator for SizedChunk now implements DoubleEndedIterator.

FIXED

• SizedChunk::drain_from_front/back will now always panic if the iterator
  underflows, instead of only doing it in debug mode.

[0.1.3] - 2019-04-12

ADDED

• SparseChunk now has a default length of U64.
• Chunk now has PartialEq defined for anything that can be borrowed as a
  slice.
• SparseChunk<A> likewise has PartialEq defined for BTreeMap<usize, A> and
  HashMap<usize, A>. These are intended for debugging and aren't optimally
  `efficient.
• Chunk and SparseChunk now have a new method capacity() which returns its
  maximum capacity (the number in the type) as a usize.
• Added an entries() method to SparseChunk.
• SparseChunk now has a Debug implementation.

FIXED

• Extensive integration tests were added for Chunk and SparseChunk.
• Chunk::clear is now very slightly faster.

[0.1.2] - 2019-03-11

FIXED

• Fixed an alignment issue in Chunk::drain_from_back. (#1)

[0.1.1] - 2019-02-19

FIXED

... (truncated)

Commits

• c0218a6 (cargo-release) version 0.2.0
• 94fb3dd A ring buffer implementation.
• 7633b30 Changelog sync.
• 81edef2 Implement DoubleEndedIterator for Drain.
• 785b590 Make drain_from_front/back also panic like it says on the tin in release mode.
• 4f4cd00 Change chunk.capacity() to Chunk::CAPACITY.
• 8a37b58 (cargo-release) version 0.1.3
• 87b1ccf Tests for SparseChunk, +++
• 21660d7 Add a default length of 64 to SparseChunk.
• e6cf5dc Changelog sync.
• Additional commits viewable in compare view

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