Add Slovene support 🇸🇮

[jglaszka]

Done:

• Added slovenian support for IntegerConverter and BankingMoneyConverter
• Added tests
• Updated README.md

Related to #105

[codecov-commenter]

Codecov Report

Merging #134 (f639f01) into master (fd31e93) will decrease coverage by 0.11%.
The diff coverage is 96.51%.

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@@             Coverage Diff              @@
##             master     #134      +/-   ##
============================================
- Coverage     98.93%   98.82%   -0.11%     
- Complexity      489      513      +24     
============================================
  Files            73       76       +3     
  Lines          1964     2050      +86     
  Branches         75       79       +4     
============================================
+ Hits           1943     2026      +83     
- Misses           10       12       +2     
- Partials         11       12       +1     

Files	Coverage Δ
...pl/allegro/finance/tradukisto/MoneyConverters.java	100.00% <100.00%> (ø)
...pl/allegro/finance/tradukisto/ValueConverters.java	100.00% <100.00%> (ø)
...allegro/finance/tradukisto/internal/Container.java	100.00% <100.00%> (ø)
...dukisto/internal/languages/SlovenePluralForms.java	100.00% <100.00%> (ø)
...isto/internal/languages/slovene/SloveneValues.java	97.67% <97.67%> (ø)
...uages/slovene/SloveneThousandToWordsConverter.java	87.50% <87.50%> (ø)