Restcall

New Feature
- Added support for multipart file upload
- Print version number with -v flag

Improvements
- If external response file is provided, response will always be stored in it

Fix
- Close request payload file at the end

New Feature
- Uncurlify: Generate a restcall template from a curl command

Improvements
- REST call errors return exit status 1
- Automatically use response as text while error parsing as JSON

Fix
- Added missing imports in main

- First release of `restcall`