v0.9.3 released

- Spelling corrected

- Changed the way how we deal with additional cURL options. Instead of
whitelisting known working options, we will now blacklist options which
don't work with the script.

- Adjusted default cURL options (--connect-timeout 60, --max-time 60,
--retry 2)

-- Added an option to keep working directory

-- Working directory wasn't removed in every situation, fixed.