add default extensions

[aniketmaurya]

Changes

Fixes #152

Type of change

• Documentation Update
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings

[codecov]

Codecov Report

Merging #153 (3f20723) into master (2e838f1) will decrease coverage by 0.03%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##           master     #153      +/-   ##
==========================================
- Coverage   79.22%   79.18%   -0.04%     
==========================================
  Files          55       55              
  Lines        1516     1518       +2     
==========================================
+ Hits         1201     1202       +1     
- Misses        315      316       +1     

Flag	Coverage Δ
unittests	79.18% <50.00%> (-0.04%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
chitra/dataloader.py	45.36% <50.00%> (+0.09%)	⬆️

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