Added field parameter to the from_json method with other required cha…

[karthikrangasai]

…nges.

What does this PR do?

Fixes #576

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• Did you write any new necessary tests? [not needed for typos/docs]
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[codecov]

Codecov Report

Merging #585 (9ffc2a0) into master (008bc75) will increase coverage by 9.35%.
The diff coverage is 93.43%.

❗ Current head 9ffc2a0 differs from pull request most recent head 1fdf594. Consider uploading reports for the commit 1fdf594 to get more accurate results

@@            Coverage Diff             @@
##           master     #585      +/-   ##
==========================================
+ Coverage   81.19%   90.55%   +9.35%     
==========================================
  Files          32      132     +100     
  Lines        1037     7782    +6745     
==========================================
+ Hits          842     7047    +6205     
- Misses        195      735     +540     

Flag	Coverage Δ
unittests	90.55% <93.43%> (+9.35%)	⬆️

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Impacted Files	Coverage Δ
flash/image/classification/data.py	89.47% <ø> (ø)
flash/image/classification/model.py	78.84% <ø> (ø)
flash/image/classification/transforms.py	90.47% <ø> (ø)
flash/image/data.py	100.00% <ø> (ø)
flash/image/detection/__init__.py	100.00% <ø> (ø)
flash/image/detection/data.py	95.41% <ø> (ø)
flash/image/detection/finetuning.py	100.00% <ø> (ø)
flash/image/detection/model.py	83.11% <ø> (ø)
flash/image/detection/serialization.py	94.23% <ø> (ø)
flash/image/detection/transforms.py	100.00% <ø> (ø)
... and 247 more

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[ethanwharris]

Awesome, LGTM 😃 Mind also updating CHANGELOG.md?

[karthikrangasai]

I have updated the PR with both the changes.