Version 0.2.0

• Minor housekeeping (updates to README and DESCRIPTION).
• Users can now pass additional arguments to rio::import() via cloud_get. For example, to set the column types or to choose the number or rows to import.
• cloud_put now returns a meaningful message on success or failure.
• New tests and workflow to directly test the API.
• cloud_get now deletes the temporary file once it is loaded into memory.
• Expand on the documentation and create a pkgdown site to provide user support.