90 allow clients to reschedule their appointment by themselves

[codecov[bot]]

Codecov Report

Attention: 15 lines in your changes are missing coverage. Please review.

Comparison is base (839decd) 90.84% compared to head (d8c5fb2) 95.09%.

Files	Patch %	Lines
appointment/utils/email_ops.py	76.19%	5 Missing :warning:
appointment/models.py	91.48%	4 Missing :warning:
appointment/tests/test_views.py	99.18%	3 Missing :warning:
appointment/tests/base/base_test.py	87.50%	1 Missing :warning:
appointment/tests/mixins/base_mixin.py	85.71%	1 Missing :warning:
appointment/views_admin.py	66.66%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #109 +/- ## ========================================== + Coverage 90.84% 95.09% +4.24% ========================================== Files 46 47 +1 Lines 4360 5405 +1045 ========================================== + Hits 3961 5140 +1179 + Misses 399 265 -134 ``` | [Flag](https://app.codecov.io/gh/adamspd/django-appointment/pull/109/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Adams+Pierre+David) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/adamspd/django-appointment/pull/109/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Adams+Pierre+David) | `95.09% <98.64%> (+4.24%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Adams+Pierre+David#carryforward-flags-in-the-pull-request-comment) to find out more.

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