Update advanced stats model

[WojciechZankowski]

Description

Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context. List any dependencies that are required for this change.

Fixes # (issue)

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[codecov-io]

Codecov Report

Merging #75 into master will decrease coverage by <.01%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master      #75      +/-   ##
============================================
- Coverage     98.22%   98.21%   -0.01%     
+ Complexity     2913     2893      -20     
============================================
  Files           396      394       -2     
  Lines          8097     8065      -32     
  Branches       1202     1197       -5     
============================================
- Hits           7953     7921      -32     
  Misses          134      134              
  Partials         10       10

Impacted Files	Coverage Δ	Complexity Δ
.../iextrading4j/api/alternative/CryptoBookEvent.java	100% <ø> (ø)	13 <0> (ø)	⬇️
...wski/iextrading4j/api/stocks/v1/AdvancedStats.java	100% <100%> (ø)	48 <2> (+4)	⬆️
.../request/alternative/CryptoBookRequestBuilder.java	100% <100%> (ø)	0 <0> (ø)	⬇️

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