Bugfix/43 flagseries incorrectly inherits

[hcpchris]

• Closes #43

[codecov[bot]]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (5e250a6) 93.01% compared to head (42b6235) 93.00%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #44 +/- ## =========================================== - Coverage 93.01% 93.00% -0.01% =========================================== Files 283 283 Lines 11539 11554 +15 Branches 419 421 +2 =========================================== + Hits 10733 10746 +13 - Misses 670 671 +1 - Partials 136 137 +1 ``` | [Files](https://app.codecov.io/gh/highcharts-for-python/highcharts-stock/pull/44?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=highcharts-for-python) | Coverage Δ | | |---|---|---| | [highcharts\_stock/options/series/flags.py](https://app.codecov.io/gh/highcharts-for-python/highcharts-stock/pull/44?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=highcharts-for-python#diff-aGlnaGNoYXJ0c19zdG9jay9vcHRpb25zL3Nlcmllcy9mbGFncy5weQ==) | `92.85% <88.23%> (-7.15%)` | :arrow_down: |

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