Add some debug output.

[arthurschreiber]

Before submitting a PR :

1. Ensure your fork is created from master branch of the repository.
2. Run npm install in the root folder.
3. After bug fix/code change, ensure all the existing tests and new tests (if any) pass (npm run-script test-all). During development, to run individual test use node_modules/nodeunit test/<test_file.js> -t <test_name>.
4. Build the driver (npm run build).
5. Run eslint and flow typechecker (npm run lint).
6. Run commitlint (node_modules/.bin/commitlint --from origin/master --to HEAD). Refer commit conventions and commit rules.

Thank you for Contributing!

[codecov]

Codecov Report

Attention: Patch coverage is 75.00000% with 4 lines in your changes missing coverage. Please review.

Project coverage is 79.05%. Comparing base (0ad179f) to head (2154afd).
Report is 1 commits behind head on master.

Files	Patch %	Lines
src/connection.ts	75.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1639      +/-   ##
==========================================
- Coverage   79.34%   79.05%   -0.29%     
==========================================
  Files          93       93              
  Lines        4860     4874      +14     
  Branches      933      933              
==========================================
- Hits         3856     3853       -3     
- Misses        699      715      +16     
- Partials      305      306       +1     

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