Added dill in requirements

[5hirish]

Description

Just added dill in requirements. dill 2

Types of change

Fixing Issue #28

Checklist

• [x] I ran the tests, and all new and existing tests passed.
• [x] My changes don't require a change to the documentation, or if they do, I've added all required information.
• [ ] My changes requires the reindexing of the current indexes.

[codecov[bot]]

Codecov Report

Merging #29 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #29   +/-   ##
=======================================
  Coverage   40.02%   40.02%           
=======================================
  Files          27       27           
  Lines        1439     1439           
  Branches      198      198           
=======================================
  Hits          576      576           
  Misses        836      836           
  Partials       27       27

Impacted Files	Coverage Δ
qas/classifier/question_classifier_trainer.py	0% <ø> (ø)	:arrow_up:

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