Bump parking_lot from 0.6.4 to 0.7.1

[dependabot-preview]

Bumps parking_lot from 0.6.4 to 0.7.1.

Changelog

Sourced from parking_lot's changelog.

0.7.1 (2019-01-01)

• Fixed potential deadlock when upgrading a RwLock.
• Fixed overflow panic on very long timeouts (#111).

0.7.0 (2018-11-20)

• Return if or how many threads were notified from Condvar::notify_*

0.6.3 (2018-07-18)

• Export RawMutex, RawRwLock and RawThreadId.

0.6.2 (2018-06-18)

• Enable lock_api/nightly feature from parking_lot/nightly (#79)

0.6.1 (2018-06-08)

Added missing typedefs for mapped lock guards:

• MappedMutexGuard
• MappedReentrantMutexGuard
• MappedRwLockReadGuard
• MappedRwLockWriteGuard

0.6.0 (2018-06-08)

This release moves most of the code for type-safe Mutex and RwLock types
into a separate crate called lock_api. This new crate is compatible with
no_std and provides Mutex and RwLock type-safe wrapper types from a
raw mutex type which implements the RawMutex or RawRwLock trait. The API
provided by the wrapper types can be extended by implementing more traits on the
raw mutex type which provide more functionality (e.g. RawMutexTimed). See the
crate documentation for more details.

There are also several major changes:

• The minimum required Rust version is bumped to 1.26.
• All methods on MutexGuard (and other guard types) are no longer inherent
  methods and must be called as MutexGuard::method(self). This avoids
  conflicts with methods from the inner type.
• MutexGuard (and other guard types) add the unlocked method which
  temporarily unlocks a mutex, runs the given closure, and then re-locks the

... (truncated)

Commits

• 407aa52 Bump parking_lot version to 0.7.1
• 5977113 Fix potential deadlock when upgrading a RwLock
• fd4af45 Merge pull request #111 from faern/no-instant-overflow-panic
• e593f10 Skip testing deadlock detection on old Rust versions
• 69f8885 Use cfg! where possible
• 6d8fa72 Remove risk of panicking in wait_for style functions
• edeaa24 Add test on panicking wait_for
• 6e92f13 Simplify with_thread_data
• 8bd0e79 Merge pull request #106 from faern/backport-libstd-style
• 01e0f8d Only store DeadlockData if feature is activated
• Additional commits viewable in compare view

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