fix(env): Do not use any name for the env by default

[rustatian]

Reason for This PR

closes #41

Description of Changes

• Update tests, want by default empty string in the root_test.go
• Update --dotenv default path (empty string)

License Acceptance

By submitting this pull request, I confirm that my contribution is made under the terms of the MIT license.

PR Checklist

[Author TODO: Meet these criteria.] [Reviewer TODO: Verify that these criteria are met. Request changes if not]

• [x] All commits in this PR are signed (git commit -s).
• [x] The reason for this PR is clearly provided (issue no. or explanation).
• [x] The description of changes is clear and encompassing. ~- [ ] Any required documentation changes (code and docs) are included in this PR.~ ~- [ ] Any user-facing changes are mentioned in CHANGELOG.md.~
• [x] All added/changed functionality is tested.

[codecov[bot]]

Codecov Report

Merging #42 (04762ac) into master (c3e1ece) will decrease coverage by 0.67%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #42      +/-   ##
==========================================
- Coverage   52.20%   51.52%   -0.68%     
==========================================
  Files          11       11              
  Lines         295      295              
==========================================
- Hits          154      152       -2     
- Misses        131      132       +1     
- Partials       10       11       +1     

Impacted Files	Coverage Δ
internal/cli/root.go	70.83% <100.00%> (-4.17%)	:arrow_down:

---

Continue to review full report at Codecov.

Legend - Click here to learn more Δ = absolute <relative> (impact), ø = not affected, ? = missing data Powered by Codecov. Last update 749b7aa...04762ac. Read the comment docs.