v1.0-beta

• Added download command to download custom content from Demisto instance to the local content repository.
• Improved validation failure messages to include a command suggestion, wherever relevant, to fix the raised issue.
• Improved 'validate' help and documentation description
• validate - checks that scripts, playbooks, and integrations have the tests key.
• validate - checks that test playbooks are configured in conf.json.
• demisto-sdk lint - Copy dir better handling.
• demisto-sdk lint - Add error when package missing in docker image.
• Added -a , --validate-all option in validate to run all validation on all files.
• Added -i , --input option in validate to run validation on a specified pack/file.
• added -i, --input option in secrets to run on a specific file.
• Added an allowed hidden parameter: longRunning to the hidden integration parameters validation.
• Fixed an issue with format command when executing with an output path of a folder and not a file path.