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Make the mutex private
Merge pull request #50 from hashicorp/sethvargo/file_watcher

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Release v0.2.0
Merge pull request #52 from jrnt30/master

Update README.md
Ignore empty keys during 'ls'. Fixes #54
Merge pull request #55 from hashicorp/h-emptykey

Ignore empty keys during 'ls'. Fixes #54