Version bump to 2.8.6

[ankitdas13]

Version Bump: Added new API endpoints

• Added account onboarding API (create, fetch, edit, delete)
• Added stakeholders API (create, fetch, fetchAll, edit)
• Added product configuration API (requestProductConfiguration, fetch, edit, fetchTnc)
• Added webhooks API (create, fetch, fetchAll, edit, delete)
• Added token sharing API (create, fetch, delete, processPaymentOnAlternatePAorPG)

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 53.88%. Comparing base (68b2028) to head (4c2c472). Report is 9 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #352 +/- ## ========================================= Coverage 53.88% 53.88% Complexity 234 234 ========================================= Files 32 32 Lines 670 670 ========================================= Hits 361 361 Misses 309 309 ```

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