Add to_csv support for Avro command

[pateash]

closes #63

[codecov]

Codecov Report

Merging #64 into release/release-v0.1 will decrease coverage by 0.24%.
The diff coverage is 91.89%.

@@                   Coverage Diff                    @@
##           release/release-v0.1      #64      +/-   ##
========================================================
- Coverage                 92.39%   92.15%   -0.25%     
========================================================
  Files                         8        8              
  Lines                       421      446      +25     
  Branches                     77       79       +2     
========================================================
+ Hits                        389      411      +22     
- Misses                       32       35       +3

Impacted Files	Coverage Δ
src/utilities/utilities.ts	76.92% <100%> (-1.13%)	⬇️
src/commands/bundlephobia.ts	89.39% <75%> (ø)	⬆️
src/commands/avro.ts	96.8% <96.42%> (-0.21%)	⬇️
src/utilities/logger.ts	90% <0%> (-10%)	⬇️

---

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 dbd62fd...ec340b8. Read the comment docs.