feat: added better error messages

[anuraghazra]

fixes #1607

[vercel]

This pull request is being automatically deployed with Vercel (learn more).
To see the status of your deployment, click below or on the icon next to each commit.

🔍 Inspect: https://vercel.com/github-readme-stats-team/github-readme-stats/4HuxJ326i2HD5gGBqcNzjEFuJneu
✅ Preview: https://github-readme-stats-git-better-errors-github-readme-stats-team.vercel.app

[codecov]

Codecov Report

Merging #1608 (91d843c) into master (d57251c) will decrease coverage by 0.18%.
The diff coverage is 95.00%.

@@            Coverage Diff             @@
##           master    #1608      +/-   ##
==========================================
- Coverage   94.81%   94.62%   -0.19%     
==========================================
  Files          22       22              
  Lines         752      763      +11     
  Branches      205      208       +3     
==========================================
+ Hits          713      722       +9     
- Misses         35       36       +1     
- Partials        4        5       +1     

Impacted Files	Coverage Δ
src/fetchers/repo-fetcher.js	96.29% <83.33%> (+0.46%)	⬆️
src/common/utils.js	98.26% <100.00%> (+0.09%)	⬆️
src/fetchers/stats-fetcher.js	91.11% <100.00%> (ø)
src/fetchers/top-languages-fetcher.js	100.00% <100.00%> (ø)
src/fetchers/wakatime-fetcher.js	76.92% <100.00%> (-13.99%)	⬇️

---

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 d57251c...91d843c. Read the comment docs.