[COMMUNITY] update outdated contributor list

[szha]

Description

update outdated contributor list by removing manually maintained list

Checklist

Essentials

• PR's title starts with a category (e.g. [BUGFIX], [MODEL], [TUTORIAL], [FEATURE], [DOC], etc)
• Changes are complete (i.e. I finished coding on this PR)

Changes

• link contributors to the automatically maintained maintained list

cc @dmlc/gluon-nlp-team

[codecov]

Codecov Report

Merging #963 into master will decrease coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #963      +/-   ##
==========================================
- Coverage   90.58%   90.53%   -0.05%     
==========================================
  Files          67       67              
  Lines        6384     6384              
==========================================
- Hits         5783     5780       -3     
- Misses        601      604       +3

Impacted Files	Coverage Δ
src/gluonnlp/data/utils.py	74.04% <0%> (-2.3%)	⬇️

[mli]

Job PR-963/1 is complete.
Docs are uploaded to http://gluon-nlp-staging.s3-accelerate.dualstack.amazonaws.com/PR-963/1/index.html