Fixed some typos in CONTRIBUTORS.md

[chaitanyamogal]

Fixed some spelling mistakes.

Sorry for the many Pull requests. As I'm new to opensource don't know much about Github.

[codecov-io]

Codecov Report

Merging #948 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #948   +/-   ##
=======================================
  Coverage   85.03%   85.03%           
=======================================
  Files         169      169           
  Lines        2854     2854           
  Branches      311      311           
=======================================
  Hits         2427     2427           
- Misses        341      342    +1     
+ Partials       86       85    -1     

Flag	Coverage Δ
#longtests	85.03% <ø> (ø)

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Impacted Files	Coverage Δ
test/test_extractor.py	96.70% <0.00%> (ø)

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[terriko]

Good finds! Thanks so much for reviewing the docs. Don't worry about putting in many small pull requests: the small ones are always easy for us to review and merge! For typo fixes like this, it's not like one change depends on another, so splitting them up as you find them is as good a way as any.