Added sort() function and transpose() in Matrix class

[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: Fixed #152

• Give additional information regarding the PR below: sort() and transpose() functions implemented with necessary checks.

[codecov-io]

Codecov Report

Merging #156 into master will not change coverage. The diff coverage is 100%.

@@          Coverage Diff          @@
##           master   #156   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          77     78    +1     
  Lines        1301   1328   +27     
=====================================
+ Hits         1301   1328   +27

Impacted Files	Coverage Δ
src/validation/matrix-sort-type.js	100% <100%> (ø)
src/Matrix/index.js	100% <100%> (ø)	:arrow_up:

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[sakshichahal53]

Hi @pbiswas101, how to handle such conflicts/ erroneous reports in a PR. Should I close it every time such errors occur and create new PR or is it some way to handle it here only?

[sakshichahal53]

@devRD I have used Code-Formatting in VSCode.

[sakshichahal53]

@pbiswas101 Please check.

[sakshichahal53]

I'll make a clean, new PR keeping in mind the suggested changes.