Jiraone

Thanks to [huyz](https://github.com/huyz) for the below fixes and improvements to v0.8.4

Fixes:
- 🐛 `get_attachments_on_projects`: Overwrite attachment file by default
- 🐛 `json_field_builder`: check if `sprint_custom_id` is None
- 🐛 `path_builder`: handle multi-dir base_dir
- 🐛 `download_attachments`: avoid conflicts/overwrites by isolating attachments (helps with https://github.com/princenyeche/jiraone/issues/112)

Improvements:
- ✨ `download_attachments`: make defaults and behaviour match `get_attachments_on_projects`

Features:
- ✨ `download_attachments`: support `create_html_directors` option (resolves https://github.com/princenyeche/jiraone/issues/112)
- ✨ `download_attachments`: support `overwrite=False` option (to speed up incremental backups)

* Fixing the CSV change file type and merge_files to run without JQL
* Added a new endpoint to `runbackup`

* Minor fix to `process_executor` function with invalid arguments

Minor update 123
- Fix to issue reported on 124
- Corrected the documentation
- Minimized arguments on each method or function to max 5, then the rest are called via keyword arguments
- Added a new function for argument validation called `validate_argument_name`
- v0.8.0 and v0.8.1 are practically the same.

Minor update 115
* Update to `time_in_status` function to include timestamp in UTC
* Update to `issue_export` method for better performance and caching
* Fix to `field` class in Server/DC Jira preventing key error
* Added to `async_change_log` method which now supports multiprocessing and/or threading
python
import statement
PROJECT.async_change_log(
jql, folder="TEST", file="sample.csv", flush=10
)


* Added new methods to `endpoint` alias for issuetype scheme, security scheme etc
* Added tests for all the major functions/methods for CI/CD process
* Added requirement for Python 3.8.x and above to run jiraone
* Removed deprecated method `get_attachment_meta_data` from `endpoint` constant as this has been active for more than 2 years.
* Removed duplicated URL link in code for `task`, `issue_watchers`, and `issue_votes` method in `endpoint` constant.

Minor update 113
* Fix to management API for organization management.