Added future dividends (#93)

[JoseMariaBernad]

Description

This is a quick change to include NEXT to DividendRange enumeration.

Fixes # (93)

Type of change

Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality)

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-commenter]

Codecov Report

Merging #94 into master will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             master      #94   +/-   ##
=========================================
  Coverage     96.88%   96.88%           
  Complexity     2950     2950           
=========================================
  Files           400      400           
  Lines          8259     8260    +1     
  Branches       1220     1220           
=========================================
+ Hits           8002     8003    +1     
  Misses          246      246           
  Partials         11       11           

Impacted Files	Coverage Δ	Complexity Δ
...ng4j/client/rest/request/stocks/DividendRange.java	100.00% <100.00%> (ø)	0.00 <0.00> (ø)

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[WojciechZankowski]

Thanks for PR!