Bumped up the NodeJS Driver MAJOR version from 1.15.0 to 2.0.0

[sfc-gh-pmotacki]

Description

Please explain the changes you made here.

Checklist

• Format code according to the existing code style (run npm run lint:check -- CHANGED_FILES and fix problems in changed code)
• Create tests which fail without the change (if possible)
• Make all tests (unit and integration) pass (npm run test:unit and npm run test:integration)
• Extend the types in index.d.ts file (if necessary)
• Extend the README / documentation and ensure is properly displayed (if necessary)
• Provide JIRA issue id (if possible) or GitHub issue id in commit message

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.88%. Comparing base (d7eed90) to head (9b5b3aa).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #981      +/-   ##
==========================================
- Coverage   88.91%   88.88%   -0.03%     
==========================================
  Files          72       72              
  Lines        6944     6944              
==========================================
- Hits         6174     6172       -2     
- Misses        770      772       +2     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[sfc-gh-dprzybysz]

Could you update the note in Readme that we are supporting GCS regional endpoint starting from version 2.0.0?