Refactor Header

[didix21]

• Now instead of using Header.choose_header() method must be used str(Header()).
• Add new enums for defining Header styles and Header levels.

[codecov[bot]]

Codecov Report

Merging #94 (1aeaf79) into master (2d31ac5) will increase coverage by 0.51%. The diff coverage is 87.03%.

@@            Coverage Diff             @@
##           master      #94      +/-   ##
==========================================
+ Coverage   88.35%   88.86%   +0.51%     
==========================================
  Files          13       13              
  Lines         498      485      -13     
  Branches       92       78      -14     
==========================================
- Hits          440      431       -9     
+ Misses         37       35       -2     
+ Partials       21       19       -2     

Impacted Files	Coverage Δ
mdutils/mdutils.py	74.40% <80.00%> (-0.21%)	:arrow_down:
mdutils/tools/Header.py	85.71% <87.75%> (+3.36%)	:arrow_up:

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