Fix sensorsafrica.tasks.archive_data

[karimkawambwa]

Description

Fix FileNotFoundError

Fixes # (issue)

FileNotFoundError: [Errno 2] No such file or directory: './temp/february_2019_sensor_data_archive.csv'
  File "sensorsafrica/tasks.py", line 12, in archive_data
    call_command("upload_to_ckan")
  File "django/core/management/__init__.py", line 131, in call_command
    return command.execute(*args, **defaults)
  File "django/core/management/base.py", line 330, in execute
    output = self.handle(*args, **options)
  File "sensorsafrica/management/commands/upload_to_ckan.py", line 100, in handle
    self._write_file(filepath=filepath, qs=qs)
  File "sensorsafrica/management/commands/upload_to_ckan.py", line 121, in _write_file
    with open(filepath, "w") as fp:

Type of change

Please delete options that are not relevant.

• [ ] Bug fix (non-breaking change which fixes an issue)

Screenshots

Checklist:

• [ ] My code follows the style guidelines of this project
• [ ] I have performed a self-review of my own code
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation