Adding change password to confluence.py

[justin-octo]

Adding a function for the following methods:

• changeUserPassword
• changeMyPassword

https://developer.atlassian.com/server/confluence/remote-confluence-methods/

Still need to update docs

[justin-octo]

Updated docs

[codecov-commenter]

Codecov Report

Patch coverage: 22.22% and project coverage change: -0.02 :warning:

Comparison is base (5d9cd15) 34.84% compared to head (4111239) 34.83%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1201 +/- ## ========================================== - Coverage 34.84% 34.83% -0.02% ========================================== Files 44 44 Lines 7940 7949 +9 Branches 1072 1072 ========================================== + Hits 2767 2769 +2 - Misses 5061 5068 +7 Partials 112 112 ``` | [Impacted Files](https://app.codecov.io/gh/atlassian-api/atlassian-python-api/pull/1201?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) | Coverage Δ | | |---|---|---| | [atlassian/confluence.py](https://app.codecov.io/gh/atlassian-api/atlassian-python-api/pull/1201?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None#diff-YXRsYXNzaWFuL2NvbmZsdWVuY2UucHk=) | `13.23% <22.22%> (+0.06%)` | :arrow_up: |

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[justin-octo]

👍