Statmanager-kr

- bug fix in z_normal test
- readme revision

Deal with capitalizing issue in article

---no update in functions---
update for the article

- little bug fixes
- Add Unittest files

Improvement

Fixed a case where the bottom and top of the y-axis were being set in an inappropriate way in some figure methods.

Fixed a bug in the results table of a linear regression where some numbers were too small and were being displayed as 0.000 due to `.round()`. Now, `.round()` is not used.

What's Changed
* merge for dev (start to dev 1.8.2.0) by ckdckd145 in https://github.com/ckdckd145/statmanager-kr/pull/10
* Merge for update 1.8.1.10 by ckdckd145 in https://github.com/ckdckd145/statmanager-kr/pull/11


**Full Changelog**: https://github.com/ckdckd145/statmanager-kr/compare/1.8.1.9...1.8.1.10

Bug fix

- Fixed a bug that prevented t-statistic from being printed in linear regression and hierarchical linear regression coefficient tables

What's Changed
* merging for dev 1.8.1.9 by ckdckd145 in https://github.com/ckdckd145/statmanager-kr/pull/8
* Merge for version update : 1.8.1.9 by ckdckd145 in https://github.com/ckdckd145/statmanager-kr/pull/9


**Full Changelog**: https://github.com/ckdckd145/statmanager-kr/compare/1.8.1.8...1.8.1.9