Remove the temporary fix for issue #32

[hlinero]

Issue #32 raised an issue about CHN data being incorrect for the year 1990 to 2001. Since ITF has updated the input CSV file for T001 with the corrections to such issue, this pull request removes the temporary fix we had created.

[codecov]

Codecov Report

Merging #66 (7a2d4f0) into master (376def3) will increase coverage by 2.10%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #66      +/-   ##
==========================================
+ Coverage   53.21%   55.31%   +2.10%     
==========================================
  Files          39       42       +3     
  Lines        1603     1712     +109     
==========================================
+ Hits          853      947      +94     
- Misses        750      765      +15     

Impacted Files	Coverage Δ
item/historical/scripts/T001.py	100.00% <ø> (ø)
item/cli.py	87.80% <0.00%> (ø)
item/__init__.py	100.00% <0.00%> (ø)
item/common.py	85.71% <0.00%> (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 376def3...f8c93b7. Read the comment docs.

[khaeru]

Superseded by #71.