Fix #152 matrix sort() added

[sakshichahal53]

Do the checklist before submitting the PR:

• [x] Have you read the guidelines mentioned in CONTRIBUTING.md?
• [x] Have you squashed your commits?

Q: What version of Node.js you've used in the project? (e.g. Node v10.11.0) A: v8.15.0

Q: Mention the Issue Number! (e.g. Fixed #8) A: Fix #152

• Give additional information regarding the PR below: The package.json has not been changed compared to upstream. These changes reflected are due to the commands "npm install" and "npm run build" which are ignored by .gitignore.

[codecov-io]

Codecov Report

Merging #169 into master will not change coverage. The diff coverage is 100%.

@@          Coverage Diff          @@
##           master   #169   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          78     78           
  Lines        1378   1406   +28     
=====================================
+ Hits         1378   1406   +28

Impacted Files	Coverage Δ
src/Matrix/index.js	100% <100%> (ø)	:arrow_up:

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[devRD]

@sakshichahal53 @pbiswas101 Is an extra validation function necessary here? We can just use string validation and add a default case? I don't think the validation function that has been written is generalised, in what other module can it be used?

[fave77]

@sakshichahal53 @pbiswas101 Is an extra validation function necessary here? We can just use string validation and add a default case? I don't think the validation function that has been written is generalised, in what other module can it be used?

I agree on this one too

[sakshichahal53]

okay