v0.2.0

Added

• Define read/1 for modules using FileStore.Config
• S3 configuration accepts a :prefix
• Delete a file with FileStore.delete/2
• List all files with FileStore.list!/1

Fixed

• S3 configuration was ignored when running stat/2
• Replaced Code.ensure_compiled?/1 with Code.ensure_loaded?/1 to fix a deprecation
• The spec for FileStore.read/2 said that it returned iodata, but in reality, it should always return binary.
• The spec for FileStore.write/3 said that it accepted iodata, but in reality`, it only accepts binary.