chore(deps): update module gofrs/flock to v0.7.1

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
github.com/gofrs/flock	require	minor	v0.0.0-20190320160742-5135e617513b -> v0.7.1

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Release Notes

gofrs/flock

v0.7.1

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• Fix linting issues and add goreportcard badge (#​34 / @​tariq1890)

v0.7.0

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• add New() function to package for creating a flock file.
• deprecate NewFlock() in favor of New()

These two changes were contributed by Egon Elbre (@​egonelbre) in #​32.

v0.6.0

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• Add method to satisfy io.Closer interface. Thanks to
  Dustin Spicuzza (@​virtuald) for contributing this in #​21.

v0.5.0

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This change includes a behavior improvement which should result in this working
across NFS mounts. This is done transparently, and should not require that
consumers change how they use the package. The methodology decided on by
understanding how the flock utility handles this on Linux.

This improvement was contributed by Dustin Spicuzza (@​virtuald) in #​22.

v0.4.0

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• support for shared locks (RLock) was added by @​theory (theckman/go-flock#​15) targeting both UNIX and Windows operating systems

v0.3.0

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Fix issues in Windows discovered using CI

• Fix behavior of TryLock() so that it doesn't return an error when the file is
  already locked.

v0.2.0

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Add TryLockContext method to try and take an exclusive lock, while providing a
retry mechanism with a retry frequency (duration) and a context. This allows you
to retry taking the lock every n milliseconds, and to use the context to time
out after a period t seconds if no lock could be obtained.

This version introduces a dependency on Go 1.7+.

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