Update fallible-iterator requirement from 0.1 to 0.2

[dependabot-preview]

Updates the requirements on fallible-iterator to permit the latest version.

Changelog

Sourced from fallible-iterator's changelog.

v0.2.0 - 2019-03-10

Changed

• All closures used by adaptor methods now return Results.
• FromFallibleIterator::from_fallible_iterator has been renamed to from_fallible_iter and now takes an
  IntoFallibleIterator.
• IntoFallibleIterator::into_fallible_iterator has been renamed to into_fallible_iter.
• IntoFallibleIterator::IntoIter has been renamed to IntoFallibleIter.

Removed

• FallibleIterator::and_then has been removed as FallibleIterator::map is now equivalent.

Added

• Added step_by, for_each, skip_while, take_while, skip, scan, flat_map, flatten, inspect,
  partition, find_map, max_by, min_by, unzip, cycle, and try_fold to FallibleIterator.
• Added rfold and try_rfold to DoubleEndedFallibleIterator.

Commits

• 03b701c Release v0.2.0
• 247d721 Use try_fold to implement some methods
• a77f005 Add rfold
• f66cbbd Implement last in terms of fold
• 31fb3d4 Override implementations, use fold when possible
• 8e17a7d Elide some lifetimes
• e6667d9 Make IntoFallibleIterator naming consistent
• a3243e4 Add cycle
• d269d1f Implement unzip
• 04620cd Implement min_by
• Additional commits viewable in compare view

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