Return more information about Invalid Header

[shystruk]

Close #58

[codecov-commenter]

Codecov Report

Merging #59 (1d382db) into master (680646d) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #59   +/-   ##
=======================================
  Coverage   94.73%   94.73%           
=======================================
  Files           1        1           
  Lines          57       57           
=======================================
  Hits           54       54           
  Misses          3        3           

Impacted Files	Coverage Δ
src/csv-file-validator.js	94.73% <ø> (ø)

---

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 680646d...1d382db. Read the comment docs.