v0.3.0

[jguyon]

Add async versions of the following functions:

• test
• transform
• not
• chain
• oneOf
• optional
• nullable
• items
• shape
• tuple
• entries

Improve the tests of the following functions by using mocks:

• chain
• chainAsync
• entries
• items
• not
• notAsync
• nullable
• oneOf
• optional
• shape
• test
• testAsync
• transform
• transformAsync
• tuple

Miscellaneous tasks:

• Refactor file names to use dash separated words
• Make asynchronicity of checks given as arguments optional when applicable
• Restrict how the NaN check can be used
• Mention async checks in README.md

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