0.6.0 - More string function supported

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 95.16129% with 3 lines in your changes missing coverage. Please review.

Project coverage is 90.25%. Comparing base (26831ee) to head (8d68c53).

Files	Patch %	Lines
pydynamodb/model.py	0.00%	2 Missing :warning:
pydynamodb/superset_dynamodb/querydb.py	97.87%	1 Missing :warning:

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #50 +/- ## ========================================== + Coverage 90.15% 90.25% +0.09% ========================================== Files 28 28 Lines 2591 2627 +36 ========================================== + Hits 2336 2371 +35 - Misses 255 256 +1 ``` | [Flag](https://app.codecov.io/gh/passren/PyDynamoDB/pull/50/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Peng+Ren) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/passren/PyDynamoDB/pull/50/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Peng+Ren) | `90.25% <95.16%> (+0.09%)` | :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=Peng+Ren#carryforward-flags-in-the-pull-request-comment) to find out more.

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